Chuckie, no that will make it worse if you don't jet for the fuel ratio remember going from 40- 32 effectively leans a fuel to Air ratio more oil = less gas. just a clip or needle change could help. Possibly a timing change, there's a lot of possibilities
Racer, be careful lapping the dome on a cool head there designed to be thicker than the Shell to put more pressure on the fire ring. There should be @ .010 " protruding from the shell, if you get it even or lower you will have some sealing issues.
Give me a little information on the head and cylinder and I will point you what way to go.
Need to know:
distance piston protrudes from cylinder deck +-
thickness of gasket measured at fire ring.
Bore size
stroke of engine if not stock
It would help to have a cc on the head, actually measured with something accurate. a syringe works
also an installed cc with the head on the bike would be the best. put a dab of grease at the ring end gap bring it to TDC then install the head and gasket. fill the head with Isopropyl alcohol, to the bottom of the spark plug hole. when done rotate untill ex port opens and let it drain out it will run into the pv cavity. just pull the plug and drain
With this info I can calc some head #s and try to see what the issue is from the theoretical side.