Glad this thread was here, I read it all before starting two 2.5G batches I just brewed in the same way/recipe to compare different hops. Both mashed at 148 for 75 minutes then warmed to 160 over 15 minutes before removing bag (BIAB). I don't think this last bit is necessary, but its one of those weird brewing myths I made up and totally believe for no reason at all. I used Beersmith's yellow dry water setting (I start with R/O). And kept the pH around 5.3.
Boiled for 75 minutes. Adding an ounce of hops total split for 60, 20, and 5 minute additions for an IBU around 22. Left in kettle for about 10 minutes after boil to start cooling and settling, then ice bath until cooled to 64˚.
Grain bill was:
Pilsner (Weyerman Barke) - 88%
Vienna (Weyerman Barke) - 7%
Carafoam (Weyerman) - 2.5%
Acidulated (Weyerman) - 2.5%
Used Tettnanger in one and Hallertauer Mittelfrueh in the other.
In fermenter for 16 days, then 14 days bottle carbonating, then lagering as long as I could avoid drinking it (14-30 days).
I think I've finally settled on a Kölsch recipe I like. So far, I like the tettnanger version just a little better. Tettnanger is a bit more floral/fruity than Hallertauer which is more herbal/earthy. I think the floral aromas go well with the lightness of the Kölsch brew.
I used OYL-044 (Omega Kölsch II). It recommends a little higher fermentation so I set it at 64˚ for 5 days then raised to 68 over 2 days, then let sit until crashing from day 14 to 16. It is the first time I have used it and the flavor/aroma is great. It does not settle out too quickly so gelatin may have helped, but after a month of lagering it's pretty clear and this is one of my standard beers for home, so hyperactive clarity is just not that important.
So far I think these are the best tasting Kölsch brews I've done out of around 9 attempts, some from kits, some recipes, some extract, some all grain.