Yes. I won't be verbose later if I can help it, but you are one curious cat and it seems like you need some help understanding how form theory and critiques tend to go around here. I also want to help you stop getting distracted be details that don't matter, or matter more later.
I chose that one intentionally because it was one of the only angles from the rear of tee where your momentum is carrying on average almost directly away from the camera/90 degrees. The other angles are not ideal. Usually the same problems people have in upshots or different throwing angles are related to the problems in their other throws. Your form is not an exception. Try to get true 90 degree angles for form critiques. Otherwise you'll just distract yourself and see ghosts. #beentheredonethat.
Your body is not recruiting the coiling pattern than Eagle uses fundamentally.
Once you correct for the camera angle and net momentum of your body down the tee (yellow arrows), you can see that you are leaving your disc way out to the West (if top of tee is North). Your field power shot (first image on the left) probably looks somewhat better to you, but that is why each picture only ever tells you part of the story. Intentional or not, you ran with that "wide rail" concept but left the main point of the backswing and posture integrity out of your form.
A major fundamental problem is that you are not fully loaded and coiled into the rear side in good posture.
Look how much more dramatic separation Eagle has between his shoulders and knees and hips. Part of the way he achieves the effect is that he allows his coil and backswing to be left behind quite like the Load the Bow drill.
View attachment 331833
Not pictured: Eagle has dramatically more separation North-South between his shoulders coiling back. In contrast, you are missing most of that oblique sling and lat loading and rubber-band like tension at the peak of the backswing. That is a big part of why you leave your rear side trailing behind you, and rounding.
View attachment 331829
Yeah, with your body and aggression and momentum down the tee you'll be somewhere in the 400s with that. I'm not even going to tell you to stop that entirely. But it's like running a V8 engine on only 6 cylinders. You possibly have 500'+ potential if you have the patience to slow down and back up to fix it.
You cannot fake leverage and posture after it is lost, or if you never had it.
Everyone struggles with this stuff.
FYI, there's an entire passage in Fundamentals about rounding because people use all kinds of ways of talking about it, but really it's just about avoiding collapse. That's why Eagle and many other pros can backswing almost "behind" him more like Load the Bow and not be rounding. It's what his posture is doing to create a powerful arm path in excelllent leverage that matters.