The best way to safely tune for MBT (minimum best torque timing) is to find max power and then back off timing until you see a 1% power drop. That will ensure your on the safe side of the "Hump". (or an aproximate equivalent is find knock then back off 2 - 3 degrees)
There is very little change in power for the timing that brackets max power and a timing spread of maybe 8 degrees from too advanced to too late timing. Very hard for even the big guys with the expensive toys to find the absolute peak.
As far as the nitromethane I'm not sure I understand it burns quite slowly but can't say for sure. I know propylene oxide will speed it up --- but unfortuantely is sometimes speeds up combustion when the car is not even running ---- makes things go boom and people drive over their crankshafts.
The ideal timing will only change slowly with boost, so you could safely find best timing at a moderate boost level and then gradually pull back timing as you add boost.
Larry
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