My only concern that leads me to think it may possibly be signal related when performing the load is that when checking the "track signal" I'm seeing 8-9 out of 10 for signal strength, occasionally going as low as 7 or even 6 - this even when directly wiring the wheels to the TIU output. Thinking about maybe pulling the board out and directly clipping to the power inputs (want to absolutely make sure I'm connecting to the correct ones of course!).
I reached out to MTH, but don't know what to do if they won't take out of warranty repairs as I'm hearing. Hopefully they will have a replacement board in case mine is indeed bad.