Hello @AlienRenders , I couldnt find a ways to directly message you on here, so I hope you can see this reply.
I am currently also having the issue that my RVT Textures are very blurry and my DXT5 is maxed out with only 51MB. Therefore im confident your solution would fix my problem, however I searched for hours in my project settings and im certain i simply do not have the settings you do. I did keyword searches that fit your screenshots too but nothing could be found. Could you help me out fixing the DXT5 Poolsize issue? I also tried changing it in the ini file and weirdly enough my defaultengine.ini does not even have the category other people use to change/increase their poolsizes. Something seems severely broken as my project is missing so many crucial settings.
Would greatly appreciate it if you could help me out here. Im at the end of my wits here.