Re: hot water in tub
It is possible that the valve has an anti-scald device installed on it. If that is the case, generally, this is a ring over a "gear" style or a "tab" lock which basically limits the travel of the valve on the hot side. This device is located under the handle.
I would recommend Googling your brand/model of valve and get the owners manual from the manufacturer. The manual will give you the specifics you need to adjust the temperature. Usually it's as simple as removing the handle and adjusting the stop in one direction or the other, then reinstalling the handle.
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