Hey Tim,
I have 2 G1's, 2 Sierra Pro's and 1 Quest 800. 3 of the 5 have CDT triggers the other 2 I haven't got to yet. One is self tuned with custom tophat and rear spring guide with a factory spring. She shoots Gamo hunters around 935-940. My Quest 800 is due up next for a tune. I have one tune kit left from a long lost member or possibly and ex-GTA family member. I love them all and will so even more when I can find someone to build me a couple custom tophats and rear spring guides for a e-3650 spring. Any of them will respond well to a lube tune and trigger and really shines with custom internals. Good luck let us know what you decide.