John,
While your reasoning for the "unequal distances" rule may be scientifically sound (pun intended), can you tell me with confidence that for any given room there is a perceivable benefit to that arrangement?
In other words, is it more often than not the case that an "unequal distance" arrangement will undoubtedly improve the perceived overall sound from the speaker?
I think there are far too many variables that affect a speaker's perceived sound for you to be able to justify recommending one arrangement as ideal.
