@Yucca Set your max to 197, your RHR to 54 and dial it down to what you get around the time you wake up, roughly. If your lowest during sleep is 45, your true RHR is probably going to be around 47-50. But if you make it too low it might break Body Resources indicator, i.e. it will never go to 100%.
As it stands, RHR setting is only used by Firstbeat algos, so you might as well make it something that makes them happy.