cam timing

I have run that Cam many times, and I have had good success in at 105* atdc, which depending upon Spring Pressures and Valvetrain Deflection, seems about right for me ?

I can't comment on your Dyno Power, no 2 Dyno's are ever exactly the same it seems, but 716/656 seems more within "baseline" BR series Comp Rollers, ie the 273/.624" capabilities, even with 1.5 ratio, and far easier on parts ?
That must be a very critical Dyno or correction factor ?