Many suggestions of improvement

[Selur]

to make more precise cuts losslessly.

So, you are creating an intermediate file.
For my taste, fps*10 is way too large of a gap for precise cutting, but I suspect you are probably not really doing a lossless cut (only cut on IDR frames).
I suspect that you use some software which does some smart-re-encoding of the split gops.

Cu Selur