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I'd check the direction of elongation also. ie is it in the Dec plane or the RA plane or flexure if in line with guide-scope gravity. That would give a clue what to look for most.
Is the extent of elongation related to length of exposure? If not, it could be hysteresis in guiding.
What do you get with no guiding? RA drift, Dec Drift, or both? Better to look near Zenith when checking this.
But, since you notice effective rotation when pointing South towards Tuc47, it indicates your polar alignment is off.
In defining exactly what the problem is, you will probably identify a solution.
Cheers,
Brian
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