I agree, You may not have your NM drilled correctly. That is one of the main reasons this ball has such a bad rep. I love my no mercy, my team mate has a toxic, and when I want I can throw anywhere from 4 to 8 boards more hook with my No mercy vrs his toxic.
After you throw your no mercy where are your flare rings on the ball, are they touching the hart. THe only problem I have with my NM, is when the lanes carry down quite a bit or they are burned up, you need to put it away it will burn up all of its energy half way down the lanes, The ball lives off the oil.