ORIGINAL: Arthur P
Might be it reallyis a timing issue, kinda following on with BOSS-2's thoughts. I'd bet you were anticipating the release with your old one and you haven't learned the timing of this thumb trigger well enough to anticipate it yet. Those surprize releases can bemurder onsomeone who's used to anticipating the shot.
Also,it's likely you aren't used to using a different batch of muscles to trigger the release, haven't really gotten comfortable with the little shift in youranchor yet,and you're just weirded out a little. It's going to take some time and practice.
I agree with this.
Practice the blank bale more than you shoot.The drills you are doing will help but you have to learn a proper release before you can be really succesful with it.