Last year (2017) I used 40% Vienna and it was tasty. This year (2018) I might go with 25% Munich which will be about the same color and we'll see how the flavor profile turns out.
2018-8-2 tweaked the recipe a bit to match Helles Exportbier for a 2fer.
2019: pils + ~30% munich
2022: 15% munich; going a bit lighter with the munich
72g split between saphir and tettnang turns this into a pilsner! not a bad thing, but altering the recipe to 2g/L instead of 3 and changed to Mittelfruh. also changed munich back to ~30%
2024: did about 12% munich and was more of a pils still. planning on some test batches with 20% munich plus some late hops to get a more malty and hoppy end result and still be helles-like.