I bought a Parker Hunter Mag 2 this year. Granted the bow was a 2001 model that had been used as a demo bow in a pro shop last year. The bow has been shooting fine up until a couple of weeks ago. I noticed then that I was getting wear on the bottom of my vanes. I use a Whisker Bisquit with the cock vane up. After looking at the set up, I noticed that my nock point (I shoot a loop) was higher than it should be. The loop had not moved up on the string (at least I don't think it has) it was really tight, but I'm wondering if my string has stretched enough to cause nock point to move.

So, my questions are:
1. When the string on a one cam bow stretches, which direction will the nock point move?
2. On the new zebra strings (like Parker and other manufacturers use) how long (how many shots) does it take before a string shows signs of stretching?

Thanks in advance for any thoughts you might have!