Lots of things could have changed and the above suggestions are good ones. In addition I would set up a bow square and make sure the nocking point is correct. A nock set too low will cause a problem like you are experiencing. Something must be really off if the point of impact is beyond what the sight can accommodate. I always paper test a bare arrow after making a large change. Once you get that somewhat dialed in the rest comes easy. Another thing is make sure the arrows are weighted and spined properly for the increased poundage. Good luck and if all else fails go to a local bow shop. My bet is that will be something they can easily help you with.