Just my opinion... they put in the larger cam to peak up the numbers and make these look more impressive on paper. I suspect that a lot of crate engine get bought purely on peak HP and torque numbers, with little understanding of what how to look at cams and such a see how that effects other RPM ranges. Use ti for street driving, where the RPM's supported by this cam are rarely seen, and you find that it is not optimum.
Agreed on the the CR being low for this cam size.