I'll like SW work on the You were tipping off the rear leg in your first medicine ball toss. The good news is that this is the same posture issue as everything else and you did improve. I want to point out a reminder of what tipping over is. It is keeping your balance over the rear foot and tipping onto the front leg. That's what you did here:
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IMHO I think you should be spending a lot of time with getting these medicine balls correct b/c we already see you trending in the right direction, and I think your body needs a lot of reinforcement that the weighted ball can help with. I will show that you need to keep improving your balance while you do it. Let's look at you, loopghost, and Simon.
You can't "see" balance unless you know what to look for and have done it yourself. It is how your head balances over your feet. I will try to show you again.
Left column: the yellow line is where I think your balance is as you shift into the plant. I think it is no longer on your rear foot, but it is between your feet, so you are throwing more stuck behind your brace than those two guys. The green lines show that Loopghost and Simon have their balance all the way forward at this point. Notice that you are still tipping a bit off your rear foot because you left some of your balance behind.
Right column: the yellow line is your balance again. Notice in the orange line that your head didn't make it over top of your front foot because your balance was trapped. Notice also that Loopghost and Simon's rear foot is weightless and their heels are more toward the target, whereas your rear foot spun out with the toes ahead of the heels.
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IMO this is still one of the best balance drills ever made because it gets at the fundamental issue. It's the same thing in dance, and the same thing in the backhand. I know you've seen this before, but you fundamentally need to be doing this in your throw as you move from the drive step to the plant. Revisit it often for now. Show us if you are uncertain what I'm trying to get you to do.
For your medicine ball tosses, I would rather see you exaggerate the tilt when you land forward.
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You should end up more like this as you release to exaggerate the balance and the correct side bend. Right now you have barely any (too little) side bend. If you add more to your move you will probably feel the ball accelerate faster and more effortlessly.
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Last, your knee throws. Good news, I'm starting to see your spine relax more toward neutral. Keep working on that:
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The tosses themselves need more of what I mentioned above. It may help you to adjust where you are throwing. Sit in the same position. I don't mind your "normal backswing" and that did look a bit better than either your kneeling throw or the first ball toss. Look at the red lines here, which are your shoulders and the trajectory the ball took. You are still not in braced tilt (like above), and your shoulders come flat "over the top." The green lines are closer to where your shoulders should end up, and where the ball should go (I'm not being exact - notice camera angle is different than the next picture). You want to look much more like Sadlowski. This will feel like your whole body is propelling the ball more "away" from you, and more "up" relative to the ground. Keep working on it, this is battling years of muscle memory!
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Almost everyone struggles with this and I don't think many people fully understand it... Hang in there!
Am i getting somwhere here?
I will work on the drill and watch that video you showed me until i pull it off and understand it.