Console command is the way. 16777216 is only 16mb.
You can try a pool size of between 3000 and 5000 depending on your video card, and what you’re expecting your players to have.
It probably is also time to start taking a look at why you’re using so much texture space. I will be 4 and 8k textures, probably on the landscape, but it’s hard to say from here…