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no you set the lower to a lower temp, if you have the top set to 140, set teh bottom to 130-135.
BTW, since you have access to teh pipes you may want to insulate them as much as possible. i have this same issue in my house and it is due to teh water cooling in the pipe before it gets to teh master bath. if i leave a sink or the tub diverter partially running, i have all the hot water i need. if i run only the shower, the lower flow rate results in no hot water after a few minutes while all other fixtures still get hot. i cannot do anything about mine since i am slab on grade with underground pipes, but since you have basement access you can.
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