I've been having problems getting my single cam bow to paper tune perfectly with several arrows. Bow is setup at 65 lbs and at 29 inch draw. According to most charts, I need a 400 spine arrow. I seem to get the small left tear with most of the arrows I've tried. I tried a PSE radial X-Weave Predator 200arrow today (300 arrow is equivalent to everyone elses 400 spine). Arrow was 28 inches long without nock, and 29 inches from tip of nock to insert. Total weight of arrow was 370 grains. Well my bow in my hands loved this arrow. I was shooting bullets through paper every shot. However, supposedly this arrow is underspinedfor my setup. I have had a couple of shop people say it will work, and others say it is too weak and not to use it. Also that it will not work with broadheads (however I do shoot with mechanicals). I could usesome advice on this. Wouldthis arrow be okay to use (I mainly hunt elk), or would I be better off to step up in spine and live with the small tear as long as it group tunes okay? Pros and cons please?