BT Speed - Slower than previous ISP Plusnet

Question

Hello everybody  Lets get right to it shall we.
ADSL Line Status
Connection Information
Line state: Connected
Connection time: 0 days, 00:12:14
Downstream: 1.875 Mbps
Upstream: 448 Kbps
ADSL Settings
VPI/VCI: 0/38
Type: PPPoA
Modulation: G.992.1 Annex A
Latency type: Interleaved
Noise margin (Down/Up): 12.7 dB / 17.0 dB
Line attenuation (Down/Up): 60.4 dB / 31.5 dB
Output power (Down/Up): 17.2 dBm / 11.9 dBm
FEC Events (Down/Up): 1 / 0
CRC Events (Down/Up): 1 / 5
Loss of Framing (Local/Remote): 0 / 0
Loss of Signal (Local/Remote): 0 / 0
Loss of Power (Local/Remote): 0 / 0
HEC Events (Down/Up): 0 / 0
Error Seconds (Local/Remote): 1 / 1
http://www.speedtest.net/result/1689620736.png
http://www.broadbandspeedchecker.co.uk/bimages/801​46...
MY BT Exchange:
http://www.samknows.com/broadband/exchange/SWLJ
According to Google maps I am 2.8 miles away but not sure on the distance when the crows flies.
BT Speed Tester Results:
Download speedachieved during the test was - 1413 Kbps
For your connection, the acceptable range of speeds is 400-2000 Kbps.
Additional Information:
Your DSL Connection Rate :1920 Kbps(DOWN-STREAM), 448 Kbps(UP-STREAM)
IP Profile for your line is - 1500 Kbps
So after having Plusnet for a few years and bad teething problems for most of it I decided to move to BT and have the unlimited package with the home hub 3. Plusnet provided me with speeds between 1.8Mbps - 1.9Mbps using their Thompson Router, on a D-link Router the speeds were the same. 
I know that BT owns Plusnet but I thought why not cut out the middle man and go straight to the main supplier, considering others in my street have speeds of 2.3Mbps and over with the likes of Sky, Talk Talk and Supanet, it seemed like a no brainer to go with BT.
My IP Profile with BT is a max 1.5Mbps and the fastest I can have is 1.44Mbps which seems strange considering I had more with plusnet? I complained to BT, the recommended way was to chat online via their chat app which to me seemed a better option. So after my first online chat I was advised that my speed was very low but to wait for 10 days for the line to stabilize from install.
12 days later the speed hits 0.8Mbps which more than warranted my second online chat. They advised me to run the usual checks, the only thing different from my setup was the change in router switching the Plusnet out for the BT Home Hub 3. So we checked everything, Filters, Ethernet Cables, Master Socket and so on....done this so many times with Plusnet and past providers but thought it best to do it all again for the sake of the BT Customer Support.
They decide that it's a network fault and the Noise Margin was to high, a few tweaks on their end and my speed should increase in a day or two. The next day my speed was 2.1Mbps and hooray I could now play Xbox 360 online whilst others used the computers, something I could not do without lag when the speed was 0.8 and 1.4Mbps. 
The very next day it was back down to 1.44Mbps and for the third time I had another online chat with BT. They suggested an engineer visit my property for which he did and changed out some internal wiring as he found some errors with my line. After he done his bits and bobs my speed decreased to 1.1Mbps, but he said he had to visit the cab outside to alter some things and then notify the exchange and my speed would increase dramatically in the next 48 hours.
The next day the speed was 1.8Mbps slowly dropping through out the day back to 1.2Mbps and stayed like that until I contacted BT for a 4th time. They ran a few tests and my speed increased but only to 1.44Mbps and this I was told was the best they could do. They advised my not to contact them again in regards to the line speed as this was the fastest I would ever get and they could no longer raise a fault with my line.
So here I am stuck with a measly 1.44Mbps wishing I was back with Plusnet, If I attempt to play online with any Xbox 360 game it is fine until someone in the house uses a computer, even to check their emails, the lag is terrible, my wife and kids are complaining about the internet speed, I have tweaked the computers for the fastest connection possible. Even when I don't go online with the Xbox 360, we still have slow connection when two people are using the computers at the same time.
I have the Xbox update with new dashboard and I also have the Lovefilm, 5OD, 4OD and youtube apps, works great when not using anything else, in fact love film states you can stream movies to 3 devices the same time, but this slow connection basically ties the whole of my family to use one device at a time, a shame really when we all like to do different things sometimes.

Answer 1

It's been like this since install in early November, as my post states they did up my speed to just over 2mbps but it lasted one day and went back to 1.44Mbps. When the engineer came out he change some wiring for me just to be sure and said there were no errors or problems at me end, then the speed dropped to 1.2Mbps on his own device. I then complained again later that day and it went up to 1.7 ish and dropped back to my usual speed of 1.44, a speed that enables only one family member at a time to use any device, but can all use the net if we visit a basic text website with no pictures or flash.
Our PC's and Laptops, Netbooks are all Dual Core, Windows 7 with huge drives and lots of Ram, not that this matters at this time because the engineer tested his own equipment via the master socket.
If I read Sky news then nobody can play Xbox online or stream Lovefilm, Youtube, BBC iPlayer or use any other computer without dreadful lag and slow speed. The speed can cope fine with all over the above when only one person uses it.
My neighbour is with Supanet and he uses his pc upstairs whilst his wife uses her laptop and their son plays online via Xbox 360 all at the same time, his speed is 2.6 at the moment and he lives next door to me?
My other neighbour on the otherside of me has Talk Talk and they get 2.3Mbps...I mean Talk Talk gives them that speed? That truly is amazing for them but forget about BT matching any such speed, they can't even match the speeds I previously had with Plusnet and I thought they were slow