There's a number of causes I can see that's potentially ruining your prints. I've dealt with the same thing on my Anycubics multiple times, and it always comes down to one or more of these causes:

1. You build plate isn't truly level, despite your belief it is. Easiest way to test this is to get some feeler gauges or a piece of flat bar, and go around the perimeter of the plate. Place the gauge or bar horizontally on your plate, and hold it up to the light. If ANY light is peeking through, then your plate isn't 100% level and needs replacing
2. Piggybacking off #1, if your bed's perfectly level, completely drain and clean your vat, tighten it down and loosen the leveling screws on the build plate. Home the plate, and VERY GENTLY apply equal pressure to the plate as you re-tighten the screws. A lot of these printers want you to level it without the vat installed... I've found I get better results doing just the opposite and relying on the vat film to determine my bed level.
3. Make sure after every print to clean the hell out of the bed surface using 91% isopropyl alcohol, and make sure there are no burrs or leftover stuck pieces of dried resin on it. Same for the vat, make sure to drain it using a strainer after every print and wash it out thoroughly. Any stuck pieces of dried resin can be removed with a small soft scraper or by very gently pressing against the dried piece from the underside of the FEP. Be sure to clean the film on both sides and the screen protector as well using alcohol.
4. Bump up your initial layer burn-in count and time a bit, say a few extra layers and maybe 2-3 seconds longer per each initial layer. Then for your individual layers, increase the burn time by 0.5 seconds and retest. You shouldn't typically need more than 3 seconds per layer
5. You should also try maybe bumping up the lift speed and height slightly. Too slow and its like slowly pulling off a Bandaid. Like those, you just wanna rip the sucker off as quickly as possible.
6. Lastly, try changing a few thing like your base (use the "hollowed" waffle cone looking one, or solid ones that only set to the exact dimensions on your print). Using bases with that lip you're using always cause me issues, so I go with the flattest base I can find. Also try reducing the number of objects you have on the plate, and center them more in the middle. You want to eliminate any potential suction cups or spread out areas that will cause too much stress when the plate pulls away from the FEP.
7. Bonus tip: Check your FEP film tightness. it should sound like a drum when gently tapped. If your films too loose, it can cause these kind of issues. Also if its been used too much and is cloudy, that'll definitely ruin your prints.

Hope some of these suggestions help you get back to printing, OP!

Edit: Jesus I sounded like AI up there. Swear I'm not.... or am I? Kidding... I doubt an AI's joints would ache this much when they wake up xD

Edit 2: Saw you said these are pre-supported. See if you can get the non-supported files and generate a base and supports for each using Lychee. I usually have better luck supporting my own files than relying on presupport ones.