Yes your nock point probably is too low now. When you set the bow at an even tiller you were on the right track. I usually set the bow at even tiller two or even three turns out from max so you got room to tune the tiller. Then set the nock point so that the arrow is at a 90degree angle to the bowstring. Thats probably real close to where you started and would quite predictably result in either a perfect arrow or a high tear. You would then crank down on the lower limb bolt to get the nock of the arrow to produce a level tear and a level arrow in the target. Your end result should be a tuned bow with an acceptable nockpoint position that doesn' t crash the arrow into the rest. You will note that this method does not require you to move the nockpoint up or down the string and it is still posible to add or subtract some poundage to the bow. Cranking down on the upper limb bolt has the same effect on the arrow as raiseing the nockpoint. Cranking down on the lower limb bolt has the same effect as moving the nockpoint down. Isn' t this an elegant solution? Good luck hunting!