One thing I'd like to know is what router or modem are you using. The stats page makes no mention of modulation type which makes me wonder if it doesn't support ADSL2+ in which case 6M might be right for a good line.
The same How/Why applies. We have not established why he isn't getting high speeds already. Until we do that, or at least rule out everything we can, migrating would be a simple leap in the dark. Not even a leap of faith.
I couldn't agree more.... My apologies for going off topic.