I used Litefirm to successfully change Vs06.EXE to Vs06.BIN:
Litefirm Vs06.EXE Vs06.BIN.
I then flashed to Vs06.BIN. Seemed the same as Vs02 or very slightly faster. Tested a CMC 40x media disk and it worked in CD Speed with 39+ speed and then I burned something on it and used Scandisk, which showed no errors with CMC media. So far I think it is the best yet of the 48x firmware.
I will have to run some more tests though.