It sounds as if the string is stretching and moving the knock or D-loop up. Check to see if your knock point has moved. If so add twists to thebottom to move the knock point back down.

It should ahve settled thru the first 1000 or so. Notafter shooting that much.

I don't know anything about the quility of the PSE strings but it sounds like you should invest in good aftermarket for gibblet, Winnerschoice or other quality aftermarket string.