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Just tested the shaft this morning. The funny thing is i printed 4 out 5 track in 0.2mm or 0.15mm layer height. Those run fine.

The only one track I used with the tpu is printed in higher layer height. That actually has more friction and prevent the track from automatically dropping (your second video).

I am going to try another print tonight to test the system. I swap out the track and now it drops smoothly.

Can I offer one small suggestion?
I am currently using the spring track modification and one of the spring fell inside the channel, and I can't get it out. On your next iteration, it would be nice to add a small slot on the side so someone can use a small stick to get the stuck spring out.