I don't know if Bowtech is using the new VTX strings or not though. I think Bowtech is using TS1. You are probably right though; there is little room for improvement on the Bowtech strings. Hoyt's on the other hand.......well let's just say the VTX were a nice improvement.
I haven't heard what the diferenc in the VTX and TS1 is (if there is any).