Good catch. I also have some Rolf Vectors (great wheels, btw), so you reminded me of my own mystery flats a couple of years ago.

It was driving me crazy and after the 3d tube change in 75 miles, I happened to look at the rim tape. It had shifted just a few milimeters to leave a tiny gap over one of the spoke holes. At full pressure, the tube bubbled into the spoke hole and eventually popped.

I was able to fix it with a couple layers of athletic tape. That worked so well I just left it until it was time to buy new tires and I got new rim tape then.