Here is what the UMOC440F looks like in the Force:
It's a tight fit, but it works. Now I just need to keep cycling the batteries. I had the controller up to max settings and it had better performance but the batteries didn't really like it because they haven't truly been used in a decade.
For the next few weeks I'm going to slowly increase my driving distance until I end up using 30-40+ AH from the batteries before I try more high-power driving.