Joe, this is a great video, thanks!! I noticed that those guys who regularly played with us in the Ancient battle "ASB" mastered the sling faster. Unlike those who boiled in their own juice. That is, static monotonous throwing develops an intuitive feeling more slowly. In ASB, we are constantly moving, throwing at each other and simultaneously dodging balls flying at us.
All the guys who play ASB with us quickly learn different throwing styles and use them intuitively, depending on the situation on the field of play.
When they come to static target tournaments, they also confidently show good throwing.
I think anyone who doesn't have the opportunity to get together and play ASB can just practice throwing in different styles and in motion. This will greatly help you learn different throwing styles faster and your body will begin to work intuitively, much like an experienced driver driving a car without thinking.
This is what our ASB training looks like. In the video, half of the guys are throwing from a sling quite recently.
https://youtu.be/6L8vZlEnZX0