Congrats Sarge, you are making some progress 
It has been my experience with the orange 6 1/2" pads and DACP(about the same as 3m's pi3 rc). that with the right amount of product, worked in long enough, and pressure decreasing the last couple passes, that i can almost goto my LSP, especially on lighter cars.
Using the RC with the 4" pads might be different though, but i would definatly reduce the pressure towards the end of the polishing of the area-especially when you think it will be your last needed go with the RC.

It has been my experience with the orange 6 1/2" pads and DACP(about the same as 3m's pi3 rc). that with the right amount of product, worked in long enough, and pressure decreasing the last couple passes, that i can almost goto my LSP, especially on lighter cars.
Using the RC with the 4" pads might be different though, but i would definatly reduce the pressure towards the end of the polishing of the area-especially when you think it will be your last needed go with the RC.