If you plan on staying with Bemans I'd step up to the 340's. You're pretty much on the edge of the spine for 70lbs. Also consider going to 4" feathrs set on a helical, or vanes if you prefer, but I like feathers and braodheads. Feathers increase your FOC and will aid accuracy. If you shoot a prong rest you might want to shoot straight/offset although I can't say what degree to set them. One thing is for sure. The problem is not with the broadheads. Straight fletching just will not stabilize and arrow with blades on the front.