I was wondering, is it possible that electronic strut adjusment might be out order, one of the struts is rock solid and the other is prety squishy

 

I assume you are doing the bounce test?
If one does not move at all, then it is busted and has seized or has WAY too much air pressure in it.
If the other is squishier than the 2 "normal" ones, then it has probably blown it's seal and has little or no damping.
The change in damping between Normal and Sport mode is not massive and not something you would feel when doing the bounce test.

 

​​​​​​I manualy adjusted strut, and solid one became pretty much like the squishy one, of course suspension has a lot of wear but i made them preety similar, i just don't how to mount servo properly so it wont readjust

 

They should be pretty firm when parked or at slow speeds.
I have no idea how to adjust them or how they should be setup.
My understanding of the damping control in the LS air strut was that it was electronic, not servo controlled, but I could be wrong.
The only adjuster I know of is attached to the ride height sensor.
If the struts have manual adjustments then they are probably not air suspension.
Can you post photos of the struts?

 

On top of this goes electric motor which turns the ****

 

I assume that there must be a description in the service manual somewhere that explains how to install the servo.
I don't know myself as my air suspension has (so far) behaved itself.