I remember originally making the transition to nitro ( i doing it again!!) lol!
First up ya tend to find that with alloy shoes you need higher revs to get them to bite, so ideally you are further into the power range when it takes off, also clutch springs can make a big difference too, i used to run Hong Nor alloy shoes all the time, and the 0.9 springs on short tracks and 1.2 springs on long tracks if you use the plastic shoes they bite in earlier which can cause hesitation which leads into other things giving you grief, personal choice i guess
as Nigel said a good base is 5000-7000-3000 or if ya wanna try a bit more aggressive try 8000-10000-1000 worked awesome in my 8.5
