Well, as far as i know, usually you should set different pool budget for diffrent quality settings, i will link a youtube video, it will show how to make all this.
p.s Setting values higher that you have should be alright, but i would rather measure how much vram every quality level consume and set pool a bit higher than that.
https://youtu.be/nElpWI2WH-g
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Thank you! That video helped to fix it permanentely :) I also managed to fix most of the bugs you mentioned and improved the map a bit.
I tried to profile the fps drains..seems like the most drain comes from nanite raster sizes. Couldn´t find a way to load seperate foliage actors instead of the whole instances (using world partition). Will have a deeper dive into that :)