Agreed.
I'd suggest that you put 'ALL' of the indoors on test mode heat. Get hold of the service manual and follow the refrigerant flow checking transducers, 4way Rv, solenoids and thermistors along the way.

Double check the HP transducer and Sensor again ( it might be worth double checking the Dip switch settings because I gave you the ones for the U.K. Version, in Macedonia they might be slightly different).
Other things to look for would be low pressure, sensor and transducer, compressor speed, target condensing temperature, P1 and P3 sensors (in the BC box), these should be between 3-4 bar ideally.

I know it sounds like a lot of things to check but without this type of information it's difficult to know what is stopping it from ramping up.