I was going to ask the same thing, I had a shop drill and tap mine that has done this hundreds of times so it came out perfect, they cleaned my carbs out too.
Anyways, I drove the screws in as far as they could go and my bike will not idle on its own, it gets lower and lower and just dies. Its also hard to rev it, it sounds like its either getting too much fuel or something else is up. Also, should I try losening those bolts on top of the caps to maybe help the idle?