I ve seen similar results with the testing i have done. Now thats there's some actual data to compare, ill post up a couple graphs from the last time i had a 250 on the rollers. All dyno testing was done with a 92 small reed engine , 41.5 tm mikuni, v force 2 reeds on Heminutt's cylinder.

Red line is Ftz pipe
Blue line is Shearer/Q

Watch out Carl and Jerry, you might get someone spewing all over "You Tube" threads that you photo shopped your dyno results..............