using a thick headgasket to lower compression is like slapping a HUGEE bandaid on a severed limb and hoping it holds. its not the right way to go about things. if you want to change your compression around look for a new set of pistons or more extreme case a new head. but a set of low comp pistons will do you just fine.
stick with a new oem headgasket.. oem was built right the first time, im boosting daily on an oem headgasket and arp headstuds for a year and a half, not a single issue. setup is a y7/y8 mini-me running 9.9:1 compression.
goodluck!
-Luke