Welcome from the Hampton Roads area of Virginia, USA. We have a Member's Map in the Upper Right of the Title Bar. Click on "Members" and then Click on "Member's Map…" Check it out and you might find some new flying friends...
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.