I would just check for the obvious like you have been. Reeds, gaskets, plugs and wires, stator and pick up gap. A leak down test wouldn't hurt either. As for jetting. I have a 421 dyno at 96 hp by redline racing and I have 35PWK carbs. 152 main jet. Cel needle in the middle clip position. 45 pilot and 1.5 on the air screw. 19 cc domes +7 timing vf3 porting by HJR. I ride at sea level on the oregon coast. That's what works for my setup up and may help you dial yours in or fix a problem.