I cannot see PM resolving anything either, my query about an afrihost account unable to even reach 4MbI git the whole overheads story, yet i eliminated this by eliminating the line as a possibility, I was told that it has never been seen that a afrihost 4mb account has reached 4mbps. that doesnt sound like a 4mb account to me.
A call to the masses, on a 4mb account, please stabalise your line to 5 or 6mb, do a speedtest and post your result. I hope to atleast find one account that is capable of bursting beyond 3.6
I honestly feel that taking this offline and chatting to the right people about this will have better answers than posting on a public forum. Just my 2c