In addition to SD's comments, you might want to re-check the stylus overhang, and them check/adjust the cartridge yaw (rotation in the headshell viewed from above) To do this properly, you need an alignment protractor (I like the DB, but there are many good ones) to insure that you have tangency at two points across the record. The fact that this occurs during the last tracks leads me to believe this adjustment may be off.