The only DJI drones currently for sale and available to U.S. purchasers are ALL grey market drones. There is no option to buy from DJI USA. They have voluntarily completely withdrawn from the U.S. market. There is no USA warranty and no Care...
In addition to GPS variances from flight to flight, be sure to launch from the same spot each time. Flight altitude is a function of your home point.
You may want to try a cross dissolve between clips to help cover up imperfect alignment.
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