TOO much compression, warning: long & boring story, i've got a couple options, what have you done? Options

[orange914]

looks like i've added 1 too many cans of compression to my 2056 build...opps...
heres the deal. we're building a 2056 for my sons 1.7 that dropped a seat... this is kennys car and he's covering cost so we're doing it on a bit of a budget. got a good deal (from a great 914r here on the 914world) for the 2.0 short block, spent money (well worth it) on 2.0 heads, located ALOT of misc. needed like tin, intake conversion parts etc...
problem is the heads are 55cc and i will need a not recomendedly (is that a word?) thick set of cylinder shims to knock the k.b. flat top 96mm pistons compression down to 8.0-8.5:1. (around 0.1 thickness)
if we dont shim (or partially shim) we have a few recomended fixes and they are:
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A valve pocket .075 deep intake and .050 deep exhaust for 42X36 valves would give you the 3ccs you are looking for.
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Or we cut toss a hemi-cut at the chambers.... As long as the CR stays up the hemi cut should help with tuning.
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has anyone done this on 96mm k.b. flat tops or on the chambers, with what results +-?

mike