Cupping your wrist and then quickly uncap at the release point takes a lot of practice to get right. Because you're used to throwing without your thumb, it shouldn't take too long to get it
right. Just many games of practice. One thing I did notice that you said was about your thumb and fingers coming out at the same time. That's very important to overcome and get the thumb out early. Practice and send us a video if you can so we can see your release.
Bob
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