I prefer to build them the way I stated, because then there's no need to back off timing and lose power. A boost retard is advised anyway, so the higher the static compression, the more timing retard would come into play. I've always thought about some kind of variable belt drive or some such that could vary the speed of the blower in live operation. There are some turbochargers out now for instance that vary the pitch of the vanes on the compressor side of the turbo to get them to spool up very quickly.
