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I think its because the PCV is just a signal interceptor which overrides the pulse width ratio (80% max) that is set in the ECU and to this date cannot be changed. I bet Wayne McDonald could reprogram that like he added the goodies like the 2 bar lamba sensor in the new tune boy. What I  do not know is if the PCV just adds to the signal or ignores it. I suspect it ignores it so tune boy still pulls fuel 400 rpms before the rev limit. I sulose if you new what it was pulling  you could fatten it up to negate that. If not bummer lean out. **** maybe I  need to save for a used dyno and go to school now that I am retired. Na i am about to give up the horse power and spend more time riding instead of breaking sheet.