Several responses to this thread were raising some theoretical red flags as to why the power was so low.
I’ve tested enough stuff with way less than optimum combinations that made decent power and ran down the track pretty well so that those items don’t look as problematic to me.
Well said. This is why I suggested going through the basics again and checking the vibration damper, cam, and ignition timing, come to think it, check that the cam is appropriate for that engine and application, and check the timing.