why did you choose for TAO instead of DAO?
Anyway, your 8x speed is too high, because you do 2 things at once
a] converting mp3>wav this take processortime
b] burning them on CD
when conversion isn't done fast enough, you get lack of information for your burner>buffer underrun.
In my opinion you can better choose for nero, but mind: when some mp3 haven minor faults, such track can be skipped by prog or it'results in a none-playable track.
When you want to be safe, convert mp3>wav on your HD first, then burn them in DAO mode.