Thanks for giving us an insight into your move and adjustments to one part of Russia. I watch quite a few Russian channels on machining and thoroughly enjoy the small differences in technique between countries.
On the taps,
"Turns out one tap is undersized! Bit of a panic. Then I tried the other tap and it's the right size. So, I've started tapping in two steps, the undersized one and the correct one. Easier cutting deep threads that way."
They may be 'serial' taps. I like the German Volkel:
https://voelkel.com/en/ taps and love their serial taps especially on tough stuff. Seem to cut a much nicer thread than the old standard type.