Very high sync speed but very low ip profile!! Ple...

Question

Hello everyone.
I have been a BT customer for almost 4 yrs now, with little or no issues during my time with them. Until now!
About 2 months ago i mustve signed upto the 20mb bb, as my 8mb bb, was working great but i though why not to the extra speed. So i sign up, and i get about 17.8mb sync rate, GREAT im thinking. SLowly, i did not realise my bb kept dropping out and eventually it lowered the sync rate everytime and eventually it halted at a 4.5mb sync. I am thinking how is this possible, i had 8mb bb and it used sync at 8.1mb without fail and speeds were excellent.
So i called them logged a fault, on 21/11/2010. I explained to them what had happened, they understood, tried to do a few things their end, however nothing change, so they booked in an engineer for 22/11/2010. he came and saw everyhting was fine (i wasnt home at the time, my mum was) so did really have a chance ot explain properly, but i told him what i could over the phone whil i was at work, and advised your premises seems to be fine, must be exchange. OK . Bt followed up asking is everything resolved,i said no changes, speed it still slow.They booked another engineer for 7/12/2010.
He came, i happed to stay home this time, and i explained to him what is happening. He checked everything, ran some line tests, and notices my line can hand 16mb but it seems to have capped. he got the cap removed and it synced at 17.9mb, im thinking AWESOME. He checked the mains, even replaced the socket, because i had a old battered one, which was excellent. He advised give it few hours the ip profile should reset itself, just keep monitoring it. He also advised if your bb line kept dropping, then it would keep lowering the sync rate and this has what had happened originally. He also advise if it starts happening again, connect the router directly the mains as it was currently on the extension socket down stairs. Once he left, as adivsed i monitored and i kept seeing it was dropping off and very very frequently like every 10 minutes. So i took his advised connected the router to the mains upstairs with a filter and it has not dropped since. this was 2 days, 2hrs 31mins ago.
However my ip profile has not changed. my sync rate has increased by more than 400% and has been very stable as i have notice with NO drop out.
I have been doing research, i have read any major sync increases the ip profile should reset within a few hrs, but as you can see it hasnt in more than 48hrs. I know i should wait maybe another 24hrs but i dont think it would make a difference. I phoned BT yday and they stated this the best your line can handle, i explained to them the history of speed and the recent incident, but told me nothing can be done and this the best i can get, they wud not understand my connection syncing how it should but the profile is stopping me from enjoying it!
I was wondering is there any way i can get this sorted, so i can enjoy really fast broadband?
Here are bb router (homehub 2.0 stats below and the speedtester results also):
ADSL line status
Connection Information
Line state
Connected
Connection time
2 days, 02:43:29
Downstream
17,832 Kbps
Upstream
1,131 Kbps
ADSL Settings
VPI/VCI
0/38
Type
PPPoA
Modulation
G.992.5 Annex A
Latency type
Interleaved
Noise margin (Down/Up)
5.6 dB / 5.8 dB
Line attenuation (Down/Up)
24.1 dB / 9.8 dB
Output power (Down/Up)
26.8 dBm / 1.7 dBm
Test1 comprises of two tests
1. Best Effort Test: -provides background information.
Download Speed
3132 Kbps
0 Kbps
4000 Kbps
Max Achievable Speed
 Download speedachieved during the test was - 3132 Kbps
 For your connection, the acceptable range of speedsis 1200-4000 Kbps.
 Additional Information:
 Your DSL Connection Rate :17832 Kbps(DOWN-STREAM), 1131 Kbps(UP-STREAM)
 IP Profile for your line is - 3500 Kbps
The throughput of Best Efforts (BE) classes achieved during the test is - 3.43:16.63:79.94 (SBE:NBEBE)
These figures represent the ratio while sententiously passing Sub BE, Normal BE and Priority BE marked traffic.
The results of this test will vary depending on the way your ISP has decided to use these traffic classes.
2. Upstream Test: -provides background information.
Upload Speed
918 Kbps
0 Kbps
1131 Kbps
Max Achievable Speed
>Upload speed achieved during the test was - 918 Kbps
 Additional Information:
 Upstream Rate IP profile on your line is - 1131 Kbps
PLEASE PLEASE, can anyone help me in getting this sorted, i know what my line is capable and i know its faster than this.
Thank you in advance and let me know if any more information is required. THanks once again.

Answer 1

Similar situation here. I fitted a BT accelerator a month after the switch to ADSL2+ to get that last little bit of speed and instead it caused repeated dropouts. My IP profile got hammered and SNR set crazily high as a result.
Removed the accelerator and have a rock solid line again. That was 3 weeks ago and my profile is now at 12000 with SNR down to 12db. Hopefully will be back to where I was before the accelerator some time by the end of January.
I am using a Dlink 2460 so could force the SNR down with DMT software but am holding off at the moment as BT's profiling is so aggressive I don't want to give it any excuse to hammer my line again.