I have all those issues with my ver 7.1. But as long as it works, I'll keep it. Always a problem with larger than 1TB drives. I can't imagine why DXTbmp would resize a file. I have yet to experience anything like that. I don't see that you can even deliberately select a size, though I may have just missed it. I'm not a fan of these super-large textures, either. To me, they're just harder to manipulate in PSD or DXTbmp. Gimp will handle them, if you have that app.
Best,
62stratfan