I wouldn't say its really eradic, but something is screwy. I was sighting in my bow out to 40 yards with my new arrows I got last nite, and my fixed heads aren't hitting right.

My fixed heads (Wasp Hammer SSTs) and (Cabelas Laser Supremes) shoot low for some reason. At 20 yards they shoot about 6" low, at 30 yards its about 8-10" low, and at 35 yards they are 16-18" low. I don't really understand what is happening here. I have had to tweak my sights a little in the past when shooting broadheads, but this is ridiculous. My Spitfire XP 100s fly perfect at all distances mentioned.

Is my bow out of tune? The arrows are going in perfectly straight, and are flying good (had my brother watch from the side), he did say they appeared to be moving slower than my field points.