Thanks for that explanation, PB! I figured it was your continued R&D leading to the changes, but it's nice to know the reasons for the changes - what they accomplish, too.
I've already picked up the behr UPW flat and will go with the 11/11/11 version.
Now my question is, which "level" - I've been going back and forth between 4.0 and 5.0, and recently thought I'd go with 4.0, because the projector central lumens value (26ftL) fit one of your recommendations I saw earlier.
I'm shooting a 106" screen from 12', and have ambient light. Not so much now, during these darkening days, but it' definitely not light-controlled.
I'm wary of going with 5.0, in case it's too dark. I really like using eco mode, because the projector is right above where I'm sitting, and that keeps it quieter.