RE: Hoyt Vectrix or Matthews Switchback XT
First off I will tell you that I went from an 2003 Razortec to a Trykon to a Vectrix. My dad still has the Razortec and I LOVE that bow, I couldn't get rid of it. The first thing you'll notice is that both the other bows are a touch heavier than your razortec.
Personally I feel that the Vectrix was a little bit more forgiving and that that it was definitely faster. My recommendation is that you shoot both the bows and go with whichever fits you the best.
My other recommendationd KEEP THE RAZORTEC!!!!