The first throws were beautifully relaxed and a model of how the arm pull should start out mellow. Basically you have issues with power generation, timing and aiming.
If you can practice with a punching bag try backhanding it as fast as you can from the reach back. Compare that to a mellow start and lightning fast end of the backhand. Check out the timing and power generation optimum for you currently. Also listen for the sound difference to double check the physical sensation of the hand to bag contact. Not a bag of a person please
No disc in hand for this one to exaggerate speed and the feel of hand hitting the punching bag. Once you get what it feels like to punch your arm forward (elbow chop towards the target) take a video of yourself and it should be immediately obvious how you're really not generating power.
Most physical motions take 3 months to teach to nervous system quickly. Thereafter the learning is slower and you'll begin to gain also via more muscle power. But you are more muscular than I am already. The difference between you and longer throwing people is speed in the arm at the end. And finer points of snapping. Like getting power from a far more powerful leg push which also allows a slightly longer final step. For your current power usage (you can generate much more immediately) the final step is fine in length. You also need to twist with your hips explosively fast to the right.
To stop you from throwing high leaning more forward at the waist and not allowing your arm to drop lower at the reach back than it's at the release helps a million. Most develop serious worm burner issues for a while before they can compensate with the aiming. to get a fast tracked improvement here I suggest not turning away from the target so much that you'll break the contact.
Flat shots need running on the center line of the tee and planting each step on the center line. Anhyzer needs running from rear right to front left with the plant step hitting the ground to the left of the line you're running on. Hyzer is the mirror of that.