Stopping the knock: Lower compression and ported heads...

I already have the .075 gaskets here but I am tempted to try a set of the .027 gaskets just to know for sure. That would put me at 11.21 to one though!
Not sure if I mentioned everything, so I'll recap a few things.
4.35 bore.
4.15 stroke
83 cc chambers. ( I thought they were 84, later I figured they were less due to the times i have had them resurfaced)
Pistons .012 below deck. ( Another discovery: I previously thought they were .017 in the hole)
Fel Pro .039 head gasket.
This comes to 10.94 to one. I previously thought I was at 10.73 to one.
Cam degreed in at 106 as stated in cam card.

As I understand it, the Cometic head gaskets can be REused?
If so, I might try using the .027 gaskets. If the engine runs fine, I'll leave them in. If the engine still detonates, I can put in the .075 gaskets I have here and use the .027s in another engine.
I'll bet this idea makes a few of you proud, huh?