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Yes, having a tighter PTFE tubing does help. I have this cheap chinese PTFE tube that has a smaller ID that provides slightly more friction.

So after 20 min of printing, my black amazon TPU having the filament spewing out from the side again ( i am using one bolt and one nut). Sigh...
My CCtree spool never had this issue and it runs pretty well. I am thinking yellow cctree tpu filament is harder compare to to amazon tpu.
At this point, I am just going to throw the amazon tpu back into my stock buffer system (which it works better).

Balancing the spool certainly helps but ultimately the softer the material, the more difficult for this mechanism to rewind the material. I cannot imagine myself go to the extent of troubleshooting every spool as, It is time-consuming to troubleshoot every spool with this mechanism. if the UNLOAD SPEED can be slow down in conjunction with proper balancing, then I think this mechanism still usable with TPU .

With the current unload speed, very soft TPU may unload faster then the mechanism can rewind. Sadly I cannot figure out where to slow it down.

I would love to hear your thought about all this.