There's no avoiding the fatigue cracks, less tension in the spokes would probably make the situation worse if anything. The way they machined them was the main problem. If you build with those hubs, don't expect more than a few thousand kilometers of riding out of them before cracks appear. If you're lucky, the flange will crack where its bonded to the carbon center tube first and you'll spot that visually. If you're unlucky, the cracks will grow in the actual spoke zone and half the flange will spontaneously crack off destroying your wheel and leading to a crash while in motion (as happened to a racer friend of mine in the early 90s).
Ok thanks, understood.
The main aim was to have the matching couple of hubs on an exposition bike, so very few kilometres made with this bike...
The problem is that the flange has cracked without riding it