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

I think(IMHO) that BigWhips idea might be correct on the lug nuts and stud issue, at least for a place to start.

I share that same thought. If the shanks on the lug nuts are too long for the wheels then it will cause this issue. I had that problem with a set of wheels about 40 years ago so I took the lug nuts to the grinder and ground about 1/8" off them to the proper length. That cured my problem.