Without hearing the problem first hand, we can only guess as to what the issue may be. I can think of a few things you may want to look at. The first thing I would look at is to check and see if you have your phono pre set properly for your cart. Maybe you have too much gain. Another possibility is that your McIntosh's pots need to be cleaned or replaced. It could also be that your new equipment is more revealing than what you are used to. Try cleaning some records and see if that helps.