Different Shrinkage on same prints

How do you control an even shrinkage on the same prints? I print models with screw threads and scaling them up and down systematically over and over again. The results are inconsistent though. I have some assumptions due to the experience with it but still cannnot be sure:

The less supports = the more shrinkage
The more laserpower ( settings for darker resin and higher resolution) = the more shrinkage
The longer the UV-light irradiation, the more shrinkage
The more translucent the UV-resin the less shrinkage

Can someone confirm or correct this?

Marcus

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