MediumRoastSteam As an update, I’ve run the machine all day today in normal (non auto-standby, non-eco) mode, 93C brew boiler, 130C steam boiler, and it seems stable between 92C-94C. I haven’t stared at it all day, but I’ve walked by it maybe a dozen times and it’s always been within range. Maybe it really was just pushing the steam boiler too hard that was causing the weird brew boiler behavior. Fingers crossed that’s the issue, 1.7 bars of pressure seems like more than enough for my needs.
Also I can totally relate to going overboard with tweaks right from the get go. The first thing I did was drop the pressure to 9 bars, which seemed pretty important, but I should really work on getting consistent dialed in results before I start messing with more things (obviously going to be impossible until my Niche arrives, hopefully soon).