Heh, I'd almost forgotten about Streamline. I have it installed, but not actually activated. But the problem with Streamline is the constant popping in and out of trees and other objects, which is why I haven't activated it yet.
I use RAEVWD, reduced uGridDistantCount/uGridDistantTreeRange (both at 15 IIRC), Streamline's fog setting to create fog at the same distance, but I have all Streamsmooth features disabled, so Streamline is completely prevented from affecting where and when things pop up.
That is the perfect combo, as it gives good value for RAEVWD without completely destroying your FPS, and makes the world even more immersive by hiding the long-distance view in fog, thus making Cyrodiil seem larger.