FWIW, I find the ERRs less sensitive to the small adjustments like toe-in, etc. Not immune, just less sensitive. As Lon says, find the right basic location, and let them bloom for a while.
It's important to remember mine are still breaking in, and my use of 6 ERRs in one room is bound to have an impact, even when I am listening to just a single pair. But inasmuch as their sound is still settling in, I don't see much point for me in constant micro-adjustments, at least, not at this point.
I don't have any room treatment yet, other than that stuff my wife calls "furniture," some of which I suspect has an effect on reflections. I am about to add some, though, and I found some reasonably priced bass trap items
here. The bass traps on the Decware site still seem unavailable, but Acoustimac seems to have a fair bit of choice. Anyone know these folks?
P.S. Doorman, how do you like your Transcendent preamp?