You are not alone Studio owner! My 2011 studio has tuning instability too, with the Kluson tulip type tuners. Drives ya mad shelling out for quality to have to tune it after every bend. Seems to really go wild when it's hot, flat in hot climate, sharp in cold (or the other way around i can't remember). But that's because the wood expands and contracts. It should be stable at room temp. I'm torn on what to do, some say you need the string to move more freely on the nut so it doesn't grab. Nutsauce lube will help. I don't want to replace the tuners. I think that the nut is cut right and that it may need actual wear and tear, like the strings actually running along the nut slots to get it settled. That's just a theory. I have suggested a leather shoe lace, weaving it through the strings above the nut and tied tight. That would give the strings less movement after it's tuned right, more grab, less slip. I don't want to say it does the same thing as a string tree on a Fender. I just don't know. I'm hoping the tuning will settle in with age and wear. Time will tell.