If you're getting too much bass, cardioid mics would certainly help with that, and would also cut down on crowd noise and room echo. Or you could try a battery box with bass rolloff.
I haven't used CAFS, but when I record with omnis, I usually clip one to each label/side of my collar so my head acts as a baffle. I know some people will do the same with 4061s, which are similar in size to the CAFS, or will thread them through the holes in a baseball cap so they stick out (a tiny bit) like antennas.