Yeah, this banding caused by 8 bit images, bake with 16bit and it will fix it (or help). Saving from 16 bit to 8 bit in photoshop will dither (add noise) which should help as well. If you can't bake 16 bit, bake 2x as large, turn to 16 bit in ps, then shrink back down, and convert to 8bit this should dither quite…