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Spacers/thicker/multiple head gaskets tend to effect the combustion dynamic in the cylinder head...
New pistons or shorter rods are the best way to lower compression.
You'd be surprised how much power you can make a .5 bar and 10:1 CR.
BMW runs 10.2:1 CR on the production N54 and N55 motors with .6+ bar boost.
Dinan cranks the boost up to .95 bar and gets 400+ HP and 440+ torque.
Most important, regardless of CR is that you have optimum control of your AFR's and ignition if you are looking at very high boost.
Ed A.
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