Good wheel build. Not "stronger spokes."

It may be too late, as you've started popping spokes. That means others likely have started to crack.

You need new spokes on the wheel, properly tensioned, and stress relieved. If I were betting, I'd say the wheel was undertensioned (especially with your weight). It's nice that you have a good relationship with a mechanic, but sadly, many bike mechanics don't have a clue about how wheels should be built. One of the "best" in my home city is proud of his truing skills, and can sometimes bring a taco'ed MTB wheel back from the brink, but he's left my (true) wheels badly tensioned. Ask anyone who's going to touch your wheels how they set and balance spoke tension -- if you get a blank stare, leave some brownies behind and take your wheel with you elsewhere.