I am shooting a Bowtech Reign 7. 70lb draw, 28" Draw length. I am trying to tune 125gr broadheads and having a hell of a time getting them to settle. I have 300 spine carnivores right now. The only thing I can come up with is that this spine still isn't stiff enough for this set up. Is there anyone with any experience shooting a fast higher weight set-up like this? What shafts worked for you?