AFAIK McCarty pickups should have enough output due to their AlNiCo IV magnets. Have you tried to raise them up a little bit? As It happens, minutes ago I adjusted my MC58 pickup height because I was losing some... mojo. Turned height screws 3/4 of a turn, and voila! allittle more growl and bite. PRS pickups are very sensitive to height adjustments.
Edited: AlNiCo IV magnets are my favourite because they are EQ "flat" and let the true sound of the guitar go through. Maybe you are tired of that sound and want more midrange push, or more treble clarity, or more low end...