A persistent drip after shutoff points toward the control path, while spray at a shower-arm joint is a local connection clue.
Record whether the symptom occurs with the control off, during shower use, during tub filling, or only when another fixture operates. The sequence helps distinguish the mixing valve from supply pressure, a diverter, or a waste-path problem.
Keep this boundary: A thermostat setting is not a complete anti-scald strategy. Follow the equipment instructions and ask a qualified provider to evaluate the full mixing arrangement.