Have you considered testing with a ballistic dummy? Im curious to see what the penetration power will be, especially with clothing on. I image youd be going overhand for those for the power, but damn that underhand throw is great for surprise. Keep up the good work my dude!
Literally just found your videos. Awesome skills friend!!! I notice with your throwing. Your right leg looks to be your counter balance and the possible secondary power lever through the final portion of your throw. Seeing it from a biological mechanics view. My brain see's a potential training addition here. If you added a light weight, gym training band. Positioned around your ankles. To add resistance. This could, over time. Increase your release power perhaps? Also added to that. You could add wrist weights. I understand that this step could potentially modify your timing and throwing calculator adversely. Just sharing a thought i just had whilst watching your technique and learning as i go.
All these videos of yourself and you haven’t noticed that everytime you throw you literally suspend yourself on your left foot and your right always kicks up. Maybe you’d have more throwing power if you kept your feet planted?