Is this the first print you’ve done with it? Have you done any exposure calibration with this resin?
Ethanol should be fine to use as far as I know. Do the holes go all the way through? If so your screen might have dead spots. You can visually inspect the screen by setting it to do a test exposure without the resin tank on it to check. Also obviously check that your tank doesn’t have any failed print bits stick to the sheet.
The industry is experiencing historic shrinkage post COVID due to unsustainable growth during COVID.
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Yep, you’ll never get it perfect, but a smaller layer height will make the steps less noticeable. Adaptive layer height in cura if you use that can help, but adds a mortal age to the length of the print.