So I'm building up some clincher wheels using zeus high flange hubs that are, as far as I can tell, identical to campy high flange hubs. Using both data for the campy hubs, and data I measured myself from the zeus hubs (which matches the campy data), and the published rim ERD (606mm, VO pbp's), I came up with a spoke length of 288mm. This is for 36h, 3 cross. The first and second set of spokes went fine, but the third (crossing) spokes seem to be too short. Even if I can get one to engage a nipple, it is passing over the adjacent spoke head in the hub, instead of clearing the hub flange. The only thing I can think of, assuming all the measurements are accurate, is I'm not twisting the hub counterclockwise far enough before attempting to mount the crossing spokes. The spokes are fairly snug in the hub holes, in fact I had to screw them in at first to get them to fit. Any thoughts / anything else to check for?