I grew up in a very "traditional" society where people assumed the boy would be older than the girl he dated or married. Back then, you just never heard (or at least I didn't)about a man M to a woman 5-10 yrs older than him! Now days, people just think, "Hey, good for her!"
Along with those assumptions, there was a certain "picture" or look for a couple. You know, the tall young man and his petite young lady. He's looking down at her as she stands on tiptoes for his kiss. As I said, I was self-conscious of my height and had always wanted to be short and little and look up....way up....into the eyes of my date. Didn't happen. I even had a couple of dates with a guy that was considerable shorter than me. I really liked him. Great kisser, too! But, it was "me" that was too hung up about the tall height being on me instead of him.
If I had to place a bet......I'd put it on the fact it was your W that did not want to draw attention to herself being taller than you. Whenever she wasn't seen "with" you, as a couple, it wouldn't make as much difference. I think when we get to be middle age, those things aren't that big of a deal anymore. Add that into her WAW syndrome, and you can take the factor of your height out of the plan altogether.
(hugs)
It is not about what you feel should work in your M. It is about doing the work that gets the right results. Do what works!