Hi Lee,
I have very limited experience with RGB filters, so I probably should keep quiet...however, I have found Astrodons to be vastly superior in keeping halos in check in narrowband imaging (comparing to Astronomiks).
Having said that, it might be not entirely fair to compare 12nm with 3nm (
http://www.iceinspace.com.au/93-770-0-0-1-0.html) and results may or may not translate to RGB.