Question Motors Shut Off, Too Weak? (2DOF)

Hey all! I've been building a motion sim based off of this design in the following video...

Before I get into my problem here are my specs...
Arduino UNO R3
2x IBT_2 Controllers (cooled with PC fan in enclosure)
24V 40A PSU with 20A fuses going to each motor (tuned down to 20V)
4 inch CTC Lever (from shaft to bolt)
25 inch from Seat U-Joint to Motors
Scooter Motor 24 Volt 250 Watt MY1016Z2 (Unknown what gear reduction it has.... here's the link to the motors on Amazon) https://a.co/d/63paYUm
Cheap 10k Pots

My motors shut off as soon as I put any kind of weight onto my rig. I tested a few things out and I think that the IBT2s are overheating and shutting off. It will hold it's own weight for a long time and only pulls 0.5 Amps each motor to hold it's weight. I apply a little bit of weight to it and it starts pulling more amps (I measured 7 at one point) and then it shuts off quickly. I took my temp gun to it and say it as high as 109 degrees Fahrenheit but I think it's very possibly it got hotter than this and that was the temp I could catch. I verified that the IBT2s are receiving 20V power from the PSU but they are not sending it out to the motors. I do have active cooling on the IBT2s with a PC fan blowing over the heat syncs.

I think the problem is with my motors, they are pretty easy to spin by hand and they are definitely not worm gear. I think this overworks the motor controllers because they do a lot of "jitters" just to keep them on a neutral plane. I'm wondering if these motors just don't have enough holding power and it puts them in a mechanical disadvantage. I did read on these forums though that others have used these motors with success. I know making the CTC level smaller could also help my case but I already only have 7 degrees of pitch at max throw so I'd like to avoid that. The Sine Test I've attached shows the motor shutting off, and that's because the POT went outside the normal bounds, that's a separate issue I'm dealing with and understand that's a problem.

At this point, I'm willing to upgrade the motors to something better fitted for this design I'm trying to mirror. I'm really lost though on what motors I should get, I see a lot of info about what gear reduction I should get, or if it needs to be worm drive, etc. I thought all worm drive was inherently self-holding but then people say they still spin them by hand? Anyway, any direction would be greatly appreciated!