Persistent issues with the pinkie (1-2-4 and 1-3-4) fingerings

https://youtube.com/shorts/bLCDxmb9PF4

Pretty much what the title says. I’ve been doing several exercises (probably more than I even need to) for the last couple of weeks to try and get the pinkie finger to work at the same level as the 1-2-3 fingerings but it’s still extremely awkward and unpredictable. I’m starting to think this might be a deeper issue than technique, finger strength, or finger independence, because my pinkie is so erratic and does a really strange hopping/flinging around motion, as seen in the video. You can see that my max speed for phrases just using the 1st 2nd and 3rd fingers are way higher and more consistent than if I even attempt to play with the pinkie. What is even going on here?