Assuming you are on an ADSL Max type package, the standard upstream connection speed is (up to) 448kbps. The Premium rate is (up to) 832kbps.
BT Total Broadband they do not supply the 832kbps option. It sounds like that's what you were on with AOL.
Your line stats from your router (Home Hub?) would help, also which exchange is it?
Re the 3rd wire, if you mean the one connected to terminal 3 then basically all the Accelerator (iPlate) does is filter that if attached. So you have done the 100% solution then possibly added the occasionally detrimental effect of the iPlate. I would remove it. It's ugly anyway, and certainly not helping even if it isn't doing any harm.
Edited by RobertoS (Sat 12-Mar-11 15:35:39)