I spoke to one of my local shops in town, and he is still knee deep in tuning bikes of all kinds. He built the heads for LE Tonglet, ProStock Chapion a couple years ago in NHRA,
His take on dynoing a bike is different than others... If I can explain this correctly.
He tunes to the best the bike will reasonably let him make, with max numbers. Then changes the specs to tune in seconds not RPM's. He'll lose a couple numbers on each side but close the gap to which that number is made, which means faster shift points.
A recent customer was running a 'Busa at No Problem. Average ET was 9.40's. Brought bike to Paul to retune and dyno. He wanted more hp numbers. Tuned to his request for more HP munbers. Bike slowed down 2 tenths. Brought back and let Paul Dyno again, using his meathods, and picked up 2 tenths from original average.
So, doesn't matter what the peak numbers are so much, but how the bike responds overall...
Paul