So I had same issue with blurry textures, and did every step from guide to fix pool size, but my problem persisted. Luckily I found way to fix this and wanted to share for any other devs that will have same issues, on top of applying all the steps from guide I also needed to put:
r.Streaming.UseFixedPoolSize 1
in my DefaultEngine.ini - i’m currently using UE 5.4, hope this save You some time.