Lower the CR if you want a slug at part/low throttle, you get more of a light switch effect.......... nothing......wham OMG. In the increased lag you'll put it to the floor just so turbo has a chance to catch up, not fun for a daily driver. You can get away with a less percise tune w/ lower compression, but you'll have a trade off, like shitty drivability.
My engine is the B16A which comes stock with 10.2:1. When I rebuilt my engine I choose to install 9.9:1 CR pistons because it would lower the compression just a bit to still have good response while not in boost, but still have good repsonse once I am in boost. I was pushing 12 psi, but soon I'll push 15-20 psi on a much more efficient turbo in the future while still sticking in 93 octane, but a conservative tune of course.
I use CP 9.8:1 on my GSR build.
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