I'm sorry, I wasn't even thinking about a PSkull. Two Perfect Skulls negate the drain life effect of the C-Ring, so that's a good way to get it done.
BUT...Throw two sockets out the window (which would have given 48% gain with PTopaz) and trade for an extra 50% on top of the occy ring is only an extra 2%. You gain more resist, but lost a lot of plus skills.
In my oppinion, sticking with the occy rings and not the constricting rings is more worthwhile.