Through my own trial and errror, I have come down to a very similar recipe. Mine uses some Special B though, 4oz. But everything else is very similar, I use CaraMunich I, which Wyermann puts at 38°L I believe. I suppose you could go for CaraMunich II, which is closer to 60°L. I do my recipe with 5% of the GRAIN bill as CaraMunich, this probably means that I use quite a bit more than you, but I also use CaraMunich I. I also use 4oz of Special B, and 2oz of Carafa Special III for the color like you recommend. I use ONLY first runnings, and this is what my recipe looks like:
24 Lbs Pilsner Malt
1lb 5oz Wyermann CaraMunich I
4oz Special B
2oz Carafa Special III
3 Packs Brown Candi Sugar
Mash @ 150 for 2hrs.
I too used to use a large dose of D2 syrup, though I would simply use 2 of the 16 fl.oz bottles or 3 of the 16oz packs, so my 3 of the 16 dry ounce packs, might be a bit short of yours, but not by much.
I always did a single healthy pitch of yeast and it generally got done fermenting in about 5 days. I pracitice VERY precise temp control, with a probe in the wort. I would generally pitch at 66, and let it ramp under modest control, by increasing 1-2 degrees per day to about 74 on day 4, then just letting it finish. Maybe Pitching HUGE has the same affect as the staggered additions. I generally did a 3L stirplate starter from 2 packs of 1762.
I agree that the corn is in the recipe, but I dont like it, so I make it without it.
During the hop shortage, I routinely used Willamette to the same IBUs for bittering, and it worked just fine.
The beer comes out fantastic, but a beer with this much flavor that travels across the Atlantic will be impossible to 'clone'. I always get a little bit of funkiness from R10 that is really only perceptible when tasting side-by-side with the real thing. The aroma is never quite right and is just a bit stale. Maybe someday I will get to Belgium!