Whilst I agree with a lot of what you say about the crossover points for the ATC mid (indeed the experiments I was party to suggest the 150 is preferrable to the 150S from an SQ POV), your posts indicate you are using a DEQX for all crossover and time alignment duties.

I have to say that I've yet to hear an interesting system that has employed that box, there's just something subjectively wrong with the end result to my ears. I know the measurements are superb (I formerly owned a full TACT system) but it just seems to strip the music of all essence and life.

So I have to say that regardless of the measurements you have managed to come up with (and I would concur with), I am likely to find the end result produced by the ATC package more musically pleasing going by past experience.

Nice looking units BTW.