OK that is one of the areas I expected from what I saw. First and foremost. Get checked by a Doc. I saw your other post after I replied here. Dont be a “tough guy” and pitch through it. I wont say it will lead to never throwing again but it can definitely lead to a hard uphill comeback.
With that being said, what I would change is your glove side arm action.
What I see in pic 4 of 137 (you are the lefty correct) is you leading with your glove to the target. What I would change here is focus on leading with/driving your elbow to the target and your glove pointed toward first base. Upon foot strike, turn your elbow GS elbow down, not out, which will bring your glove in line with your target, help you stay closed and eliminate you flying open with your glove. I would also flex your wrist as you drop your GS elbow, so your GS palm is facing your chest. This will allow the back side of your glove to finish against your right chest as your body come towards your glove…
Why do this? The farther apart you are on the top side (your equal and opposite seperation from GS to TS) the more strain you are putting on your throwing arm. This will also speed up your arm action as well. Think of a figure skater as they are doing their spins. What happens as they bring their arms into their body? They spin faster, because the “lever” shortens.
I am also willing to bet 1000 LTP dollars, that when you miss your target, you miss high and to the left most of the time.
In pic 7 of 137, you can see how your open glove side has now caused your head to to come out of alignment with your belly button to compensate for your glove side being open. If you can get your glove side to stay closed and stabilize out front, I bet everything else will come back into alignment.