Wheelbuilding / Wheel Building / Wheel build help

Again, IIRC the Jobst Brandt Retrogrouch™ wisdom is that spoke breakages are almost always fatigue failures due to too many stress cycles. Spoke tension doesn't affect how many stress cycles the spoke undergoes or how many it can withstand before failing (I think). His recommendation is to keep tensioning the spokes until stress-relieving them puts the rim out of true, then backing them off a touch, re-truing, and stress relieving them again. If they stay true that time then they're good to go, basically. I don't think he made different recommendations for different wheel uses.

If you haven't tried this technique which is to ascertain the amount of tension a rim can handle, I would do it very carefully. What you're doing is going over what the rim can take and then backing off. But how far is safe so that you can see that you have indeed gone over? If you go too far you can ruin a good rim. It's happened to me a few times so I'm generally careful when the tension is reaching that point.