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Can the hot a cold supplies be isolated independently of each other to each bathroom ? If the answer is no I would consider adding extra isolation points this will allow the sections of pipework to be isolated to find a mixing issue ? , it could also be that there's a major difference in supply pressure between the hot water and the incoming cold supply it can then overcome the hot supply and cause these sort of problems in shower mixing valves and taps.130° f is 54°c here in the UK we heat our stored water to 60 °c , 110°f is 43°c which is the setting shower manufacturers set their equipment to avoid scalding this is often not enough for some customers, a few things there to consider please keep us updated . Regards Kop