What joint motion do you use currently? Wrist, forearm, elbow? Some combination? Happy to take a look if you’d like to post a clip.
Also, if you take the table-top tests and tell us what metronome markings you get, and on which tests, that would be interesting to know. We created the tests as a way to simulate picking motions as best we can without a guitar, to remove the complexity of the instrument from the equation. If they’re not easy or doable for certain players, that’s feedback we’d appreciate, and we’ll try to come up with other tests or workarounds.