Well, I have continued to play with these bows. I have a new set of strings on order for the Destroyer 350 but I have been loving the 340. Took it to the MOAS in Red Deer and ended up taking 3rd place in the MBR class with a 445 grain arrow. Its amazing how improved the accuracy is on a high FOC arrow.
The CE piledrivers have a 44 grain insert that, combined with the 100 grain point puts 30% of the arrow weight at the tip getting the FOC to about 16%. I am starting to think its a better trade off than the higher speeds that many think are necessary for the 3D.