- Regarding your observations about the "electrical" response shapes from the testing of your 3143 network : any electrical response study only tells a partial story / you'll now need to look at the "net" acoustical responses obtained by the actual drivers with those filters attached.
- Everything you've posted above is really quite interesting ( especially the 2420 circuit ) / but taken alone, those electrical responses don't conclude much of anything .
- an "in room" RTA for each of the 4 sections would be a good next step .