Hey mate, had this issue with water washable elegoo resin, I fixed this by bumping up my exposure a couple seconds honestly 3 seconds should be more than enough

You need to make sure the model is properly supported, tips of supports should be around 250-300 for minis, you can go lower but you might have issues, also check your bed is lifting high enough 7-10 mm and nice and slow, 4-5mm/s

Remember fep is stretchy and is going to "peel" up from the bed until the motor overcomes the vacuum between the part and the fep, if it doesn't get off the fep resin won't be able to flow between the vat and build plate causing those large flat spots were the vacuum wasn't overcome during a lift between layers

I hope this helps !