Also if you want to use the SNR Target adjustment, bare in mind it doesn't save the options after a reboot.
I have tried that, I set it to 60% which should give me 9db SNR (syncs at 15 initially) but it has only managed to get 12 db which is still an improvement and gained me some speed. My ISP is Talktalk on LLU so I dont know if they have some way of stopping this getting to much of an improvement.
Anyway my main issue was bad SNR overnight with my old router (a Linksys WAG354G) which went negative on the initial profile they gave me. This D-Link is way better and has not dropped below 13 overnight (prior to my playing with DMT). Once I have some stats and Talktalk fix a bug which stops me registering on their forum I'll ask on there if my profile can be changed to give me more speed.