Our 412s in Cyprus normally only need an adjustment to torque matching as we transition from Summer to Winter and back.
When we do get a set of engines / governors / AFCUs / control frictions / DAFCS set up and behaving, they are normally fairly stable day or night but we dread having to change a governor / AFCU as that one change can lead to weeks of pain. We can go through three or four governors until we get one that is well suited to that particular aircraft. Get a bit tired of loading and removing ballast weights!!