Have you checked the tiller. It soulds like you have more pressure on the bottom limb that the top limb. Hold your bow straight out like you are going to shoot it and start drawing the bow. Does is start pointing up or down, down I bet. The tiller should be set to even but if it is and you are still having this problem you can back out on the bottom limb bolt ½ turn which should be enough and then tighten the bottom limb bolt 1/8 at a time until everything feel right as far as aiming goes. You will have to reset your nock and tune after this.