Help - vibrations from front end on new 14s not there with the 13s on

On that lug nut issue that would be if the lug nuts were too what shallow ie not enough thread? If they are too "long" they would still tighten down. So the solution of grinding them off would be at the wheel end. i am not understanding how that would get the tighter. The lug nuts I have are tapered and closed on the outside. If I grind off some of the taper (towards the wheel) they would be slightly wider where they seat. I fell like I am missing something.