IMac no longer connecting @ 270 mbps on 5GHz n Network in wide mode....

Hi everyone,
Hoping someone can shed some light on this.
I have a wrt610n dual band n router. Up until a few weeks ago all my n enabled devices were connecting at speeds of upto 300 mbps (except the iMac which would only ever reach 270 mbps).
Now the iMac will only connect at 130 mbps max. Both network utility and alt clicking on the wireless icon in the menu bar read a rock solid 130 mbps, whereas a few weeks back it was a rock solid 270 mbps.
I have been through all the usual rigmarole of checking settings on the router, re-flashing, deleteing all existance of wireless networks on the iMac etc.
No matter what the iMac will still only get 130. I can put my 2 laptops next the iMac and they will both hold rock solid speeds, in excess of 200 mbps for the HP and 300 (yes 300) mbps for the MBP.
I know for a fact my router hardware is set to wide (40 MHz), and that it is the 5GHz band I am connecting to. I am using WPA2 Personal AES for security. I have been through fiddling with the Beacon Interval, RTS and Fragmentation Thresholds as suggested in other posts around the net, even forcing the mcs to 15:270 mbps etc etc, all with no avail.
Before anyone starts, it's nothing to do with the country I am in, or inflated speed quotes by manufacturers, 300 mbps is realised for me so be sure I am not dreaming of theoretical maximums.
This network throughput was excellent, capable of streaming full 1080p HD to the Xbox whilst numerous other transfers are taking place, now this glory is no more.
Basically it was connecting at 270 mbps in this location with the self same settings, and now it is not. So far as I can remember nothing has changed drivers wise on the iMac...
In case it is of help I have grabbed this from system profiler.
Software Versions:
Menu Extra: 6.2.1 (621.1)
configd plug-in: 6.2.3 (623.1)
System Profiler: 6.0 (600.9)
Network Preference: 6.2.1 (621.1)
AirPort Utility: 5.5.1 (551.19)
IO80211 Family: 3.1.1 (311.1)
Interfaces:
en1:
Card Type: AirPort Extreme (0x14E4, 0x87)
Firmware Version: Broadcom BCM43xx 1.0 (5.10.91.27)
Locale: ETSI
Country Code: X3
Supported PHY Modes: 802.11 a/b/g/n
Supported Channels: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 36, 40, 44, 48, 52, 56, 60, 64, 100, 104, 108, 112, 116, 120, 124, 128, 132, 136, 140
Status: Connected
Current Network Information:
dehouseofting_N:
PHY Mode: 802.11n
BSSID: 0:22:6b:86:3a:27
Channel: 40
Network Type: Infrastructure
Security: WPA2 Personal
Signal / Noise: -63 dBm / -91 dBm
Transmit Rate: 130
MCS Index: 15
Other Local Wireless Networks:
dehouseofting:
PHY Mode: 802.11n
BSSID: 0:22:6b:86:3a:26
Channel: 5,1
Network Type: Infrastructure
Security: WPA2 Personal
Signal / Noise: -56 dBm / -88 dBm
Thank you in advance for any help

have I really extinguished all possibilities? Does anyone have anything so say?

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