I had the same issue.
DO NOT use screw in studs if you decide to AX the car. They just are plain old not safe. I ordered studs from this guy
14mm studs in various lengths and paid a local machine shop $35 to drill out the hubs and rotors and press the studs in.
I then got these spacers
1 inch spacers and I now have plenty of room on the inside. You can also get 1/4 inch spacers at, of all places, Pep Boys and use them in conjunction with the studs. For the rears I wish I had bought the 100mm studs. I got the 80s and with the thickness of the brake rotor and the thickness of the wheel itself, I just barely have enough stud thread for full engagement, but just barely.
Neither would I use any spacer larger than the 1/4 inch with lug bolts. I have no empirical evidence of my own, but I have been told it isn't safe. I'm willing to go with that.