Use Youtube player, easier to manipulate framewise. I'll bite the bullet this time to help a lifter bro out.
You are now getting taller in the "prep step" (good).
Your Hershyzer posture in transition is trending a little better, however... (remember I am
very much empathetic to your struggles in particular):
This is going to appear very subtle to you but you are still not
quite "shifting from underneath". Drills can teach you this faster than throwing because they can mega-exaggerate it. You probably need to address your balance with a sustained campaign involving nuclear warheads right now, not a few days with a scalpel. I would be focusing all my firepower on the transition move from Hershyzer/Double Dragon/Turbo Encabulator if I were you. Bigger, longer, more momentum, in good posture, over and over. Kick the Can gets more effective IMHO after that which I'm increasingly appreciating. Over and over and over and over again. We can help you faster if you show us how you are drilling rather than just throwing.
Sometimes this move "clicks" faster for people because the plant leg swinging back helps you coil up, and it still involves a "shift from underneath." I forget how much you've worked with this one specifically.
Another persuasive attempt
I have never seen anyone with significant tipping issues and leg and balance confusion like this solve it overnight. Needed thousands of drill reps myself, not sure in your case but IMO worth the effort if you want to fix it. My old habits flare up occasionally and the fix is easy: I bombard them again with drills I've practiced over and over and recover quickly. I can often fix issues now the very next throw because my body recognizes them immediately.
My strategic advice is to view your weightlifter posture as a
syndrome when it comes to learning to throw. The cure is to counteract those countless thousands of repetitions with new muscle memory traces. If you discover another "hack" I'm not aware of I
definitely want to know about it.
Specific form points - this is simpler to learn if you just drill it out a piece at a time, baby.
1. You are still hiding a tip away during your prep step. I think this is causing your rear leg to extend and kind of "reach" a bit for contact with the ground, which is also locking the leg up slightly. Notice also that your front knee is leaking open/pointing forward whereas pros generally move with the front knee and hip more closed at this point.
2. You briefly drop onto your x-step, but you are sneaking a little rise again in there (blink and you'll miss it but it's there, somewhat hidden because you are tilting away). So you end up still tipping over into the plant. You can't fix this without working on (1) due to how posture and balance interact with the ground.
You basically need to get rid of as much of that lean/tip away in the X-step as you can, start drifting out of the prep step, land the X-step, and continue the X-step alllllll the way through a Hershyzer into the plant.
Simon's transition move is uniquely good so don't beat yourself up too much, but his balance is actually the opposite of yours in each stride including before the X-step (Pratt drill), which is why he can move like that with the front hip closed and rear leg coming in more naturally like walking without stretching that rear leg to compensate for tipping away. It took me what felt like
forever to start to solve this.
Expectations & Perspective when learning something fundamentally new:
Long Run Perspective: most coaches I've talked to who bother to get data break new player development into 5-year phases. 1-2 is basic motion and safety. This phase might take longer for certain persons and adults. 3-4 is onboarding more advanced skills and movements. 5+ is advanced skills and optimizing+pushing limits with specialized body training. You can try to skip the first phase but it carries predictable risks.
Btw I usually add distance to putters and mids and lose a little on drivers at first because the way the arm swings/pulls through always changes as the way the lower body move changes to commit power into the release and drivers are very sensitive to release angles and trajectories (and speed). I've learned to just be patient with it because the time to regain control over drivers decreases faster after each subsequent change, then I'm throwing them just as far or farther with less effort. Not sure if that's a general pattern but it probably is.