I know this is a lot of work, but another problem that you may be seeing is that the factory pressed the studs into the bracket. Sometimes the stud will not break but will "turn" in the bracket and will not "grip". So my recommendation to weld the studs back in is to prevent this from ever happening again. Personally, I used self locking nuts which allowed me to "snug up" the new studs without over tightening them and distorting the trim. All these little nuts are difficult to reach on an assembled car, so work done well now will save you a lot of work in the future.
