Most likely, you are overspined. Real quick way to tell: If you are right handed, shoot one of your shafts bare(no feathers) from about 15 yds into your target. If the nock end goes right at impact, you are too stiff in spine. You will need to use a heavier point to weaken it into the "sweet spot" for you. If the nock end goes left, you are weak in spine requiring a lighter point. Of course you are looking to have a shaft that impacts straight(there is variation of opinion on this) into the target. That's a very brief description, but it will tell you whats going on. Hope this helps.
Ethan