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I am also pondering about tiny mechanical flexures influence on polar alignment.
For instance if I drift align by a method facing West instead of East and get different results I presume that is due to flexure.
Also I run Refractors side by side with an SCT. I generally drift align using software using the SCT - which may have some tiny mirror shift happening that the refractors don't. I ponder would I be better off drift aligning using the refractors?
Other than these considerations I presume once your drift alignment is under an arc minute its refraction that is predominantly causing the errors in your final stages of drift alignment - particularly when it comes to elevation?
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