Just thought i'd post back to say things have improved somewhat:
Uncapped upstream now (yes, it
was capped

). SNR was changed only to 12, was very stable and saw an improvement in sync speed. Forced a SNR of 9 through DMT tool and am seeing a stable connection at:
Statistics Downstream Upstream
Line Rate 14785 Kbps 1063 Kbps
Noise Margin 9.3 dB 9.7 dB
Line Attenuation 21.0 dB 5.7 dB
Output Power 0.0 dBm 11.8 dBm
I'll make sure thats stable for a couple days and see if i can get it down to 6dB. BT seem to have me on a 10mb profile however. Thanks for everyones help tho!