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I can honestly say that on a street car you can't run an 11.5:1 compression ratio at ten PSI on pump gas without getting detonation. You're welcome to try but be ready to replace some pistons.
I just honestly don't see why people see lowering the compression as such a bad thing. As long as you can read a compressor map you can match a turbo to your engine. As long as you match the turbo to your engine you won't be out of boost long enough to worry about engine response. Just make sure give the turbo a good intake and exhaust. You will be able to run so much more boost. With lowering the compression the negatives are far outweighed by the positives. It is the other way around with high compression and advanced timing. What works for N/A will hurt a forced induction engine.
Also, diesel engine use compression to ignite the air/fuel mixture. So you can't really use them as an example here, they are a completely different animal. Also they don't inject fuel at TDC, they inject it just before TDC.
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