Lately, I've been having issues with my prints sticking to the FEP. Even after levelling. I've been using Elegoo black resin but I"ve never changed the settings in Chitubox for the resin. I figured Elegoo black resin is the same as any other colour. WRONG! It takes much longer to cure (who would have thought, that a darker resin would reduce light transmission

). In addition, I looked up articles that people were having with objects becoming detached from the supports. I guess the trick is to lessen pull force.
One way that I have been using, is to coat the FEP with a silicon type oil that dries clear. Hit and miss with that approach but it does reduce the prints sticking to the FEP considerably. But the article said to try and reduce the amount of surface area that the resin touches the FEP by hollowing out the parts. Initially I never thought that was an issue, since I wanted my parts solid, but even hollowing out my objects a little seemed to have helped and my prints are coming out dimensionally correct, without deformation.
TazMan2000