I just put a vaportrail limb driver pro v 2014 or 2015 model on my new bow. The bow is a brand new Parker Ultralite 30+. 69.5# 27" draw 400 gr arrow. it has a string stop and I played around with it a bit, even took it off and it was a tad bit more quiet with out it, but had a lot of vibration..so I put it back on and tried the credit card width gap and the slightly touching the string thing...no difference. I put bow jax on the limbs, no difference. I was told it was the rest, possibly the cord..anyone know? any suggestions? I do love the rest.