I've worked on a number of well maintained cars, but lately I've been getting a lot of poorly maintained (mommy mobiles). I prefer to use my PC (more experience/comfort)but I will take out the rotary on very difficult jobs. I've found that even with my rotary (1500 rpm), cutting pad, and PB 2.5 the swirls are still visible. It could be technique, but I keep it flat, no pressure, and move slow. Is it time for some stronger stuff? If so, what is an easy one to work with?