OK, to circle back to the beginning, I no longer think the problem is overpitching. A while back I asked on the forum about krausen-free fermentations and was told, by someone whose opinion I respect, that the two main reasons were high fermentation temperature and overpitching. I had ruled out temperature so I thought the cause was overpitching. Now I don't think that is it and there must be another factor at work. I have some ideas but it will be a couple of months before I can test them out. I'll be using dry yeast for my next brews.
I'm still not sure I know what "symptom" you're troubleshooting. I don't know that I have ever heard anyone mention "krauesen-free" fermentations. I wouldn't know if my fermentation is free of krauesen because the fermenter is in a fridge the whole time. I know you mentioned "estery" beer and to me that says that the fermentation temp is higher than you want. Also, I have to say that a beer that is fermented and was "overpitched" shouldn't REALLY stand out as a bad beer, IMO. Maybe it could stand out but I have to assume that on some batches in the past I pitched more yeast than was necessary and maybe the beer wasn't a perfectly-made beer but it was still a very good beer that I happily drank. Some of my best beers were a lager made with the fresh yeast (from the package) and pitched from the starter. This suggests healthy yeast and it also suggests that there were fewer cells in the wort at the start of the fermentation which means the yeast went through its various 'flavor-producing' phases. That discovery alone made me think that less yeast should be pitched when harvested slurry was in the picture.
i hear you, im increasingly interested in lagers with strong yeast flavour.
also, tbh wasnt sure what OP meant about "no krausen".
could probably have an FAQ or template on how to post a help thread for people here. ie.
-yeast > pitch rate if known or relevant
-size of wort/beer
-any relevant nutrient additions or water profile
-hop amounts/ibus
-time periods
??
if someone just says "my beer has no krausen while fermenting" i dont know what that means at all
I'm envisioning the "foam" on the beer's surface and a lack of it in this case. Ales seem to have a little more of this because of the temp and a lager fermentation is usually a little more subdued although there would be foam/krauesen in either case. If I just so happened to notice that there was no foam on the surface of the beer during fermentation, I don't know that I would point to overpitching but that may just be me and my ignorance on the subject.
I'll just beat this one point a little further: I remember a lager I made with 940 Mexican Lager yeast and it was my interpretation of Victoria Lager from Mexico... amber color, balanced, refreshing, etc. I got it on tap and just remember it being SO good. Everything about this batch of beer was perfect, IMO. When I checked my notes, turns out it was the first use of the 940 and I made a 1.5 liter starter (stirplate, btw) and pitched the entire contents of the starter. As time went on and I noted this or that batch as being particularly good, I would check my notes and sure enough it was the first run of the yeast... 2124, Omega Bayern, 940, 830, whatever. The subsequent batches (when slurry was used) weren't subpar at all... they were very good... but not QUITE as good and I feel like there was a nuanced character in the beer that just pushed it over the top and I feel like it's these flavors that the yeast produce in their various stages. Okay... sorry for the loosely-related tangent.