I never sailed NP RS/S; but of course if you are fed up with broken equipment AND like the feel of top class sails, why go down to 75% masts AND stay with NP? Makes no sense! As for the GTX, I sailed the '07 7.0 and liked it better than the Vapor comparatively, as it showed 95% of the performances with less weight and easier feel. Just my personal impression.
Anyhow, I am a very very happy Maui Sails user too, and I do agree 100% with Ken. If you like race sails and want serious reliable stuff, no need to step down since what you are looking for exists in reality: go for the TR-4s, or used TR-3s, with their SRS 100% masts.