I was referring to the waveyness in the center, though the warping on the esges is partly caused by both the oils and the cooling shrinkage, I believe.

The uniform buckling of the layer in the middle of the sheet is what I’m leaning on, but I don’t believe that your fan speed is too high, or there would be more seperation between layers as the filament would cool too much before adhering to the layer below.

I believe there are test STLs that assist in Dialing in your settings for printing plates in particular, but I’m avoiding printing surfaces that large until I get an enclosure built.

I’d say your print time per layer might be too high, aince the filament looks to be contracting off of the plate as it cools. I’d see if there was a way to speed-up the print time of each layer, or break up the plate’s large surface area with holes or other features to dissapate the stress as it cools.