Hmm, well here are a few things that might help:
This setting in your texture will ensure that only the highest mip is loaded in instead of all mip levels.
If you want to directly control which mips your textures are using, you can do so here:
If you wanted to build up your own custom mipping system, you could do that through the use of setting this value via custom primitive data (per-object), material parameter collection (per group), or a quality switch (per-platform / per-scalability)
