I have a similar higher than normal BP at around 150/90. I take meds which keep it in check but I think stress is the cause of mine, and my Garmin watch seems to confirm.
My heart rate variation (which is how the watch measures stress) suggests I'm highly stressed most of the day. Fortunately I get loads of good sleep, and that lowers my daily score, but I seem to be overly stressed when I'm awake - not that I'm always aware of it. I reckon its part of who I am and I've become somewhat used to it.
That said, I have now started to address it with deep breathing and stretches etc. Early days yet, but I'm hopeful. I reckon if i can reduce the stress then I can get my BP down too.