I didn't see the post earlier.
I have worked on about a dozen CZs, and at least 6 TS variants. On the lightest of triggers, this issue is observable and very common in most specimen. The easiest solution for TS variants (being SAO) is to reduce the hammer hook height. This reduces the ground/distance sear has to travel up to release the hammer. But one has to be very careful, as this can easily be overdone, and I had been able to go beyond point of return on 2 of the pistols (both mine).
CZC and CGW hammers solve the issue largely due to lower hook height on the hammer, and a slightly different geometry for sear to hammer contact altogether. The CZC competition hammers still needed some reduction in hook height, although quite little.
I would not advise polishing any further, as its easy to get to the point where the sear would no longer be able to reliably engage with the hammer, and you could end up having a pistol that would empty the mag as soon as loaded!
Some of the pistols had a more pronounced presentation of the issue you faced, some had slightly less, but they all had it.
I owned 4 of TS that I had worked upon, at different periods over the years.
I would observe the sear movement from the rear of the pistol, when squeezing the trigger. It rises up, and then releases the hammer. The upward movement is reflected in your videos, as its the trigger squeeze that drives the sear up.
A lighter hammer spring makes this feel less obvious, but then you might need extended firing pin for reliable ignition on all primers. Also, the lighter hammer spring will reduce the trigger weight a few ounces.
