power valve question

i started with 76 in front and 80 in rear [stock] i went down to 73 on the front due to the fact the front plugs were showing rich. they look very close now but i haven't tried a wide open burn since. squirters went from 31 front and back to 37 front and back. i only changes one squirter at a time between runs.
this is on a eddy head 340.