I am not a doctor, so take this with or without a grain of salt :)
My understanding from my Dr. is that the lower (diastolic) pressure is the more dangerous one.
In my own case data is your friend, so grab some daily readings (same time/circumstances) if you don’t already have a baseline, and then change one thing at a time and as gradually as possible. Measure, assess, adjust, repeat.
This circumstance looks more like one needing tuning rather than a complete on/off switch.
Stupid question: is he rigorously salt-free?