RCM's only get rid of pops if it's dirt/dust. If it's pops because it's been played a lot and the grooves are wearing out, nothing can help that out. A RCM is a must and makes a huge improvement, so can't think of why it wouldn't in your case? hmm did you clean the stylus? Are you putting too much cleaner on. It took me some time to get the routine down. If you use too much or not enough cleaner, you will actually get more pops. I guess maybe you took pretty good care of the records. I also have the RDIII.
good luck I'm sure you'll get it working right.
good luck I'm sure you'll get it working right.