Ah, got it now.
Contrasting with my proposal, you're (essentially) taking the mobility assets out of the second brigade, strengthen it with some light infantry; then attach the tanks of that to an "extra" Territorial Defence unit that would essentially control a AOR to protect Blue from breakthrough through Green 1 territory. And concentrate artillery into a brigade.
Territorial Defence, you're basically grouping into: Border West-of-Rhine, Border East-of-Rhine, Urban Capital Zone, Eastern Flank Protection; the Light Brigade would serve as active defence forces in the last three areas.
Distributing the forces in my proposal could yield very similar results. Using your regions, i'd station for that:
1st Brigade : maneuver unit / eq your heavy brigade; would likely screen 2nd DAC in peacetime
2nd Brigade : spread between 1st DAC, 3rd DAC and 4th DAC
1st TC Rgt/Bde : 1st DAC (stationed at Bensheim and Michelstadt)
2nd TC Rgt/Bde : 2nd DAC (stationed at Bad Duerkheim, Bad Bergzabern and Worms)
3rd TC Rgt/Bde : 3rd DAC (stationed in Mannheim)
Essentially lacking in my proposal in contrast would be a 4th regiment for the 4th DAC. Alright, not that hard to raise
As for a concentrated artillery brigade, i think that's basically a question of strategic outlook. I'm personally thinking of a sort of a watered-down NATO AMF(L) battlegroup concept for the DACs, which had such light organic artillery forces.
Do we expect a DAC to be overrun or flanked? In that case it would be good for each DAC to have organic artillery assets.
Also, some of these DACs are pretty big; with an attached howitzer battery, you might be able to support more than just one battalion during defense.
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Area - BLUE consists of the following German districts, and has been sorted into political subdivisions as following:
Capital District (pop 520k; 267 km²)
SK Mannheim, SK Ludwigshafen, SK Frankenthal
Rhein-Neckar-Region (pop 828k; 2333 km²; capital Heidelberg)
Rhein-Neckar-Kreis, Neckar-Odenwald-Kreis, SK Heidelberg
Region Heilbronn-Franken (pop 698k; 3281 km²; capital Heilbronn)
Main-Tauber-Kreis, Hohenlohekreis, LK Heilbronn, SK Heilbronn
Region Karlsruhe-Nordschwarzwald (pop 1415k; 2810 km²; capital Karlsruhe)
Enzkreis, LK Rastatt, LK Karlsruhe, SK Karlsruhe, SK Baden-Baden, SK Pforzheim
Südhessen (pop 363k; 1344 km²; capital Heppenheim)
Bergstraße, Odenwald-Kreis*
Vorderpfalz (pop 780k; 2487 km²; capital Neustadt a.d. Weinstraße)
Worms**, Rhein-Pfalz-Kreis, LK Bad Dürkheim, LK Germersheim, Südliche Weinstraße, SK Neustadt, SK Landau, SK Speyer
*- minus: city Breuberg, community Lützelbach (both in North-East corner of district)
**- plus, from LK Worms-Alzey: community Monsheim, community Westhofen, city Osthofen (all bordering Worms)
The subdivisions are on a sort of "ethnic" basis actually, mostly regarding local dialect patterns.