Maybe a trade off between the ability of the IC to cool the boosted charge vs the amount of additional heat caused by the raise in c/r? The c/r jump is counterproductive to the effeciency of the IC/air charge into the cylinder to the point of deminishing returns? So if a 1 point increase c/r should net a 3% increase in power, maybe the additional cc heat is worth a 6% loss, for a net 3% loss?? IDK, but this is interesting to the point that it makes my head hurt thinking about it. Please keep this going, thanks for sharing.