Are you damaging the tractor by doing this?
If you jack a tractor too much you can:
-rip/break off the gladhands and;
-mash the fairing, hand rails up against the trailer thereby damaging them.
The "approach" you make to each backing situation is different and important.
-are you backing a 53 with a tailsweep that could hit/damage any trailer on your "blind" side?
-is there adequate room on your blind side and did you determine what is in your blindside as you approached for your back?
-it's always better to pull forward how ever many times you need to so your truck is as straight as possible and you are more aware of your surroundings. Don't try to wrestle it into the spot. It's easier to pull up.
-don't oversteer while backing. The shorter the trailer, the quicker it will respond to input at the steering wheel. I can always tell the new drivers when they back:
oversteer to the right;
oversteer to the left;
oversteer to the right;
oversteer to the left.
At some point they figure out they are wrestling the trailer into the spot.
Take a deep breath and chill.... you got this.