So in the video I basically describe what going on. I’m trying to find a tremolo that works. I don’t undertsand the tabletop tap test with flexsion/extension, does it not apply to a picking motion? Because I don’t see anywhere in the course that describes using that motion. The table knocking is definitely my fastest motion. I use to be a strictly wrist player but took a long hiatus and can’t get anywhere close now. It’s disheartening for sure… 
but trying reverse dart motion, and forearm I can’t get anywhere close speed. I can from the forearm in the air but can’t apply it to the guitar especially with an anchor. And my only fast motion is an extreme dsx elbow motion with my palm completely flat which only works as a party trick. It’s impossible to actually use that motion for anything else besides tremolo. Maybe there’s something you guys can suggest or see that I can’t. Thanks!
Apparently I have good DSX tremolo.
What I am doing is rotating my forearm, which is relaxed and not tense, in a jerk off motion in turbo mode. Sorry the the description lol.
This motion is RDT DSX wrist, but it sounds like you have to experiment with grip, pick point, and/or other positioning adjustments to avoid garage spikes. Be sure to watch how to take tap tests to guitar in the Primer. Troy even discusses how to trick yourself if this translation is proving diffcult.
The “tall mouse” motion is close, just with the arm rotated. But that’s not really why we put the door knocking motion in the tests. We just needed a motion that is easy enough to perform that most people can do it. This helps us rule out a universally low speed limit on all motions, which could be an indicator of any number of things going wrong.
I know what you mean. Elbow is easy for some players to learn as an on/off switch type of thing. But Rusty Cooley, Bill Hall, and Vinnie Moore are good examples of what is possible with elbow motion once you can learn to chunk it in groups. This is the key skill to make this motion useful. I would start by trying to slow it down very slightly and apply the chunking tricks from the Synchronicity seminar on a single note at at first.
You can also continue to experiment with other joint motions as a kind of side project. I just wouldn’t make this your number one all-day activity since it freezes your learning at an early stage and never lets you proceed to chunking and fretting.