Fred was right. The clouds cleared and I tracked it west and it drifts the other way. So it's flex. You can see in that last animation, as the scope approaches zenith (I think it went from 40 to 80 degrees before it clouded over and rained
) the drift changes from left/right to straight up. This animation runs from about 50 down to 20 degrees West so the vertical movement is missing, and a few may be out of sequence but still ..... Very Interesting ....
And if this is flex then it must be happening all the time and it must be making the stars bigger than they should be. Hmmmm.