you playbacks never fail to impress me,

I used the new 'grid layer' to align it , so the shapes are aligned to a grid line when rotated. then it allows for precise use of the eraser.
It can misalign because there is a discrepancy in the theoretical intended angle, and practical observed angle of rotation.

The theoretical rotation is precisely 36 degrees, however, in practice, the app will use decimal values like 35.9 degrees (between 35 and 36) or 36.2 degrees (between 36 and 37).
The misalignment will highlight the variation between what we expect and what we actually observe, it's science we're doing science :D

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