Hey Quack... I've got the VP150, and as to whether dialogue is improved using monos, I'd have to say no for normal listening levels, but yes as you approach 'reference' levels and above. Makes sense since the load is reduced on the 3805.
Since adding the monos, the M80's themselves are certainly cleaner at higher db's.(100 db's and beyond).
I don't do it alot, but it sho is fun after a few beers!
BTW, I have 2 2200's, not 3 like Tarun.