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You're on the wrong track. That is tilt not tracking error.
Tracking errors affect all stars in the shot. Your stars on the right are quite round (a tad elongated). But on the left they quite long.
Your camera is not square to the telescope. If you are using adapters to connect the camera look for where it is not seated properly or the camera is sagging in the focuser or the focuser is sagging under the weight.
TEC Feathertouch focusers flex least when they are upside down (they don't flex much though).
Sure you can do PEC and get rounder stars but if your polar alignment is relatively close and your balance is relatively close and your autoguider is working then you should get round stars pretty easily with a PMX. You should not have to work at it too hard.
Greg.
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