Out of my 65# @ 28" BW PCHx, with me drawing 29", I shoot 30" VON-BOP CX350s with 225 grains up front, for a total weight of 614 grains. They seem to hoot.
Out of my 78# @ 29" BW PLx, I shot the same arrow except with 300 grains up front, for a total weight of 704 grains (the difference must've been in the feathers or wraps). They went pretty quick, too.
When I get my Shrew of about 65# @ 28", I am pondering trying the CX250s in order to keep the total arrow weight down around the low-600s, hopefully - but that's just guessing at this stage.
Great shaft, the CX, anyway.