They look like air bubbles to me, but it is weird they only come out after the bath. Could be they were already inside, but only covered by a thin wall of resin.
I usually use Isopropanol for bath not Ethanol, so I am not sure how your resin reacts with that. The bath should also be rather short, like 1min or something.
A few things to try:
- If you are shaking your resin before print, then give it like 10 minutes after you pour it into the vat, so all bubbles come out and pop
- lower the print speed
- add wait times between the end of lowering the plate and light on
- try to hollow out the model if possible, so there is less printing volume
It’s absolutely not. Median is a value in the middle of a sorted set and average is, well, average. In the set of 1, 7, 10: 7 is median and 6 is average.