Well this is strange, When I reboot my PC and went back into Win 7 its now showing all the various burn speeds as being available. The last thing I did was install dvdinfo pro today, perhaps it had something to do with it? I dont have anything to burn at the moment to test it. It's been stuck at 4X since I installed Win 7 a month ago but looks like its fixed now.
Ill report back the next time I burn something, If its still 4x ill try those drivers you posted, Thanks!