Ok, I played with the timing some and this is what I found out. It works best when the arm is completely upright for about last 4-5" of draw length. I think that I will probably have to use the 340's. The 400's are a little touchy. The speed difference is only a few fps, but it is a little more forgiving. Fletching contact seems to have gone away, but now I have to decide on what to use for an arrow. Thanks guys.