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So the bearing does help. So I implemented the new bearing in setup.
The yellow spool in the picture runs fine now, but the black spool's track still had a tendency to get stuck
The track is the same both v1.2. so is the gear v1.2.2 printed with 0.4nozzle @ .2 layer height?

I also tried tinker with the unloads speed, but it doesn't seem to has much of an effect when filaments are loading back into the mmu after being expelled from the bontech gear from the nozzle. Can you shed some like to which parameter actually affect the speed which the filament feedback to the mmu and the mechanism? Having that dail down would help i believe.

Thanks for all your help, it's getting very close.

UPDATE: I printed a new set large, cap, small gear, and bearing insert. I made sure the bearing and all the component fit snuggly now. Before it was the gear was too loose lead to unforeseen friction in the mechanism.

However, I still notice sometimes the mechanism would rewind just a bit too much pulling the filament out the mmu unit. Would you say i play with the weight ratio? Also I still can't figure how to slow down the unloading speed.