Hey tt,
How old is the house/doors. Years ago before prehung doors, when carpenters would hang a door they would use all sorts of techniques to balance the opening. When removing the hinges from an old door do it carefully, paying close attention to what’s behind the hinges. As Joe said, it’s the last thing you want to do. Often times you’ll see little pieces of cardboard or even pieces of shims behind the hinge. Some things are better left untouched.
Today with the advent of prehung doors, you won’t have that problem. Everything is done by calibrated jigs. Each door is the same as the one before it and after it. Continue to tinker with the adjustment and it will get better.