BTW,I'm currently shootingBeman ICS 400's w/100 gr pointout a55# @ 30", drawn to about 31". They fly great, butmay be a touch on the "stiff" side even w/my longish draw.
I know nothing about the CX shafts, but I'll bet a dollar to a doughnut that you're overspined...& I'm sure of it w/those 400's & your point weight.