say i wanted to mill my head as much as possible to get like 12:1 cr
i am at like 10:8.1 now and want to get as much as poss gain

how much can i mill without negatively affecting my shit

usdm itr pistons in a 93 lsblock with itr intake cam
how much can i/would u mill??
or should i just save up and get bigger dome pistons?