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Well, that's confusing. I now tried to remove the pins for shorting under the drivers, and the motor works. Yet, it still spins in random direction..

30min later, I have the same problem after editing the marlin numbers to the ones on your site (your ones). Z didn't work from the start, but now it does (but it moves pretty weird, compared to back then when it moved smoothly).
And now that I tried connecting nema 17 as before, it works really weird (but I guess it should, it's a different motor after all).

EDIT: I changed some firmware settings (

define DEFAULT_AXIS_STEPS_PER_UNIT { 650, 650, 2700, 500 }

define DEFAULT_MAX_FEEDRATE {On the way, 1, 0.35, 4.17}

And Z with Y turn pretty smoothly. Just gonna find out the right number to put instead of "On the way" and I'm good I guess. But one problem still remains - it turns in random direction. Acceleration is 20mm/mm/s so I don't know how much lower should I go.