Not sure about Honda's (although I doubt they are breaking the laws of physics), but you generally can make more HP with lower compression and more boost. As you mentioned, there is a tradeoff in off boost HP which is mushy with low compression. So basically, if you are going with a "hot" street car, keep higher compression and limit boost. For a drag car, lower the compression and up the boost. Take a look at the turbo Dodge's. They run pretty low compression (not sure exactly what, but its a non interference motor), and they routinely run 25-30 lbs of boost on street motors. This could never be possible on a 10:1 Honda motor.