I just recently did my rear wheel with Buchy spokes. They hung up at the same place you described. A small push got them past that point, after which they were free in the hole and the assembly continued without problem.
It did leave a little nick on the hub at each hole. Afterwards, I thought I could have opened up the hole just the slightest bit with the next largest drill at the proper angle.
If you have time call them Monday, or do what i did.