I have some 55-60 POC arrows that shoot fine out of the bow. I believe that there is a big difference in the way a POC and A Doug fir fly due to density and weight of shaft. Cedar is light, Fir is heavier. I called in the question to Surewood and am waiting on his response. Just trying to find the equivalent shaft with the same point weight, nock and fletching in the fir as I have in the Cedar. Guess I'll go ahead and fletch and install nocks on the fir that is one spine under and one over, full length, and see what happens.