i have a 7mil longrod twister crank,coolhead,34pwk.run 110,and when it was running it had 192psi on each cyllinder!it has some pitting on one of the domes and it keep blowing orings!i would like to drop the psi to about 180 if possible by changing the dome size!i can't finda size on the domes i have now!any help would be gratful!by the way it is 68mm bigbore cyllinders,stock style,sleeper!thanks shane