I don't remember where but I think I once read something about rain fade getting worse the higher the elevation (or was it lower? or both?). Also, what SS were you getting? Because your 1000.4 is going to pull signal a little better then the 1000.2's Dish predominantly installs (Although that might not even matter, took a look at satbeams.com and Miami fits perfectly in the bottom of the hottest zone of the satellite's footprints).Too high for what? I've used the eastern arc several times at Midway Campground on the Tamiami Trail (US 41) about 50 miles due west of Miami with a 58.4 degree elevation.
I keep trying to think of reasons Miami is an WA only market and nothing else besides the elevation and maybe weather(?) comes to mind.