Good advice by the guys. One thing I would like to bring up is your comment about the bow making more noise. This could be because of a couple things. #1, you're shooting the same arrow at a higher weight. The bow is producing more energy, but the arrow can only absorb so much of it. A higher percentage of the the vibration is being retained by the bow, thus more noise. #2, the rigging (string and cables) may have crept (elongated). In this case the cams may be slightly over rotated. The weight and draw length may be greater than when new. This can lead to more noise.

You need to get the bow checked for it's proper specs (brace height, A2A, and weight). Adjust as necessary and this should help. And know what these measurements are and check them periodically.

And lastly, just as suggested, move to a stiffer arrow. If ya don't want to spend the money then turn the bow down to about 65#. That's enough to kill anything on this continent anyway.