Hi Mark, Welcome to BOL.
I too, at 46, feel beat up at the end of a day of carving. Must be all the time I spend stuck behind a desk.
My buddy has that same Factory Prime 178 and loves it. He is heavier than you at 190 lbs. and 6’2”. I would say my style is similar to yours (more upright and down the fall line) and I weigh about 160 lbs. My current favorite board is the Donek Metal FC 171 which has a running length close to your board but with tighter sidecut radii at 11-13meters. I also have a new shape FC Glass 175 but have not had a chance to compare since our season was lame last year. Would recommend either the Metal FC 175 or the Metal FC 171 depending on what running length and sidecut you want.
FYI - Sean at Donek builds a decent product and I have worked with him several times over the last few years on custom boards with great results.
Cannot comment on the UPZ boots as I am a long time Deeluxe user.
Hope that helps. Take care, Tom