Re: string jumping off the sled
I'm not sure if this will help, but on a 3 month old tac I don't think the parts are worn out.
When deploying the cocking block pull it out just far enough to hook the knocking loop. The cocking string is meant to wind around the spool in a certain direction. If you pull it out too far you could cause the string to wrap in the wrong direction, causing it to pile up onto one side of the spool and then drop off, causing a loud popping sound and possibly having the arrow pop off during the cocking procedure. (For more info see the "Trouble Shooting" section at the end of the PSE written instructions)