Ultimatezap: Congrats! I, too, have a big screen - a 55" plasma, mounted behind and between my Ohms. I had thought about a curtain for them, but based on the sound I am getting, and on Mapman's comments, I am going to leave it be. Before the Ohms, I had put up a good number of acoustic foam panels on the plane of the Ohm cans on the side and front walls. But I also felt it was a litle too dead, and have removed some of them. I do have the Ohms toed in slightly, which for the Walsh series actually attenuates the tweeter output at the listening position. It is a tad warmer than neutral, but I prefer it that way.
As for the phase issues, you could leave it alone, but make sure it only the terminals that are switched. Make sure the Walsh driver and tweeter are not wired out of phase with each other (I couldn't tell you how to do this, however).
Blueranger - Ugh. Another Ohm Walsh owner, like Mapman, reinforcing the need for serious wattage with the Ohms. As you may have read, I recently tried 500 watt class D monoblocks with my 2000s, and I absolutely agree with you. Unfortunately, I can't afford a new amp. I still enjoy listening, but all I can think about is how good the 2000s sounded with those 500 watters. Dang!