I gave up on alternate picking for that exact reason, it’s constant tension, at least for me, I only use it if a line or part of a song needs it. Bare in mind thats three years ago, I’m not a professional by any means but am obsessive about technique. I think you’re much better at alternate than me, what you’re doing is really smooth. Just keep hammering away at it. I’m sure others can give better responses. Though In my personal opinion once you’re at a certain level you are the best teacher for yourself as you can feel everything thats going on, you have everything you need to improve. Tho… I’m not an alternate picker so anything I say could be nonsense lol
Now I just do full usx with various other techniques if it’s necessary. Though I don’t learn a lot of other people’s songs, so I’m free to do full usx without much issue, I think it’s all you really need most the time with a few pull offs to fill out the lack of alternate.
One thing I never see get emphasized is in your practice pick as lightly as you possibly can, thats where all the feeling is, if you train super light it’s stimulating the fine motor movements. The nervous system rather than the muscles. If you’ve ever had a few beers and played great n everything felt great it’s because your nervous system is being stimulated, ofcourse to much drink and it all falls apart.
If you crank up the distortion it will help a lot in being super light in picking. It highlights every mistake