I've still yet to try any melanoiden. You like its effects over just going more Munich?
I'm truly too inexperienced to be able to answer that. Chopping and changing from style to style.
For the Vienna mash I debated doing a decoction, eventually deciding against it so added the 2oz of Melanoiden to the grist instead. I suppose one could argue that in such small amounts the difference may not be detectable in any event. I've used it in these small amounts as a mock-coction in this and my Helles.
This is the mash profile I used for the Vienna. Too thick owing to the needed infusion to mash-out. I have a different plan for next time and may omit the Melanoiden.
Vienna Mash Profile (Needs work)

I left the Melanoiden out of the Dunkel I brewed 2 weeks ago using a single decoction. Impossible to compare the two I guess. Such different beers.