Mine is all Best Dark Munich with just enough midnight wheat to color it up. I may step mash my next batch for maximum fermentability.
I've made all Light Munich (except for the Carafa Special), Light Munich and 10-29% Pilsner, and 50/50 Light and Dark Munich +10-20% Pilsner versions (as well as a number of Czech versions with varying amounts of CaraMunich or CaraAroma) (did I mention that this is probably my favorite style?). I've strongly preferred the all Light Munich versions, so far, with the Light/Dark Munich mix as the runner-up. I just have never got around to making the all Dark Munich version, but I'll remedy that in a few weeks!
I definitely want it more German... like Augustiner. So, to review: Drop the CaraMunich or lower it to maybe 2 ounces. Maybe a Hochkurz mash of 145x30 and 158x60? That I can do. On my system, if I reserve a gallon of the mash water (thicker mash for the 30 mins) and heat it to boiling, I will go from 145 to 158 when that water is added. Maybe lower the OG a smidge too? Also, Brauer... are you thinking that less Munich and more Pils would be better here? When I was over there, I tried the Dunkel at U Fleku in Prague (nice) and the H-P and Augustiner dunkels in Munich (better, IMO) and I would absolutely want to target the Munich version. I want to make this right so if you feel like posting a completely new recipe... I would LOVE to see it.
I'm wondering about the water composition too and I also wonder if it's possible that this beer would be dark enough that I wouldn't have to add any acid to the mash to lower the mash pH... that would be a first for me. Cheers.
As I mentioned above, the more more Munich the better, for my taste, but I haven't made an all Dark Munich one, yet. However, I'm a little cautious recommending it to someone that doesn't like to experiment with new flavors, if that brewer hasn't made beers with lots of Dark Munich, before. I don't think I've ever gone over 50%, myself. A good Dark Munich is a delicious, but complex, malt.
The only other trick with lots of Munich, is that you still want it to dry out. If you do decide to push it up near 1.052, you still want it down to 1.012 or, better still, less, IMO. Pilsner Malt will probably help dry it out, but the flavor will be a bit flatter. That will probably make a beer more like Spaten or Hofbrau Dunkel, which are very nice beers that I've had liters and liters of, but not the best examples of the style. Probably an easier drinking version, though, and a lot of people prefer these versions to the more complex ones. I make beers that I'm going to like, mostly, but they are not always the beers I would make for someone else.