Just to contradict, I fitted Magura fat bars to my Ten and did not drill the holes out. You get them wrong and your gear points in the wrong direction. Then what? Drill again? Also with the stubs filed off there is plenty grip to hold the switch gear in place. If it doesn't work for you all you need to do is get new inserts with the stubs. I also like the idea of the gear being twisted round the bar if the bike is dropped rather than the levers snapping off. The surface finish on the bars may have something to do with the security of the gear. The Maguras are not smooth.
Regarding the vibrations they almost disappeared with the new bars without the weights. There is no reason for me to alter the bars just to put weights on.
Hope I haven't confused things too much

Rob