No matter how good your tune, the gas will still predetonate at higher boost. The lower compression lets you run more boost and timing without having to worry about it. Keeping your timing normal is more important than keeping the compression. You are basically multiplying your boost times your compression ratio to get combustion pressure, so higher compression exponentially raises combustion pressure. And another reason for replacing the pistons, if that is what you are concerned about, is that you need pistons that wont develop hot spots under boost and break. Forged is the way to go!
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Originally Posted by Shownomercy
explain why you see more of a power gain from a lower CR compared to a higher CR with the same boost level?
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Less compression = capable of more boost on the same tuning and fuel. More boost, everything else being equal = more power. The slight loss in NA power is definitely worth it