Well seeing as I've had 2 or 3 sets of tires balanced by basic balancers on 15" rims and they vibed, Martin (whos rims I bought w/ tires) had issues getting them to balance too, and then I went an balanced on a GSP9700, all spec'd 0 ounces, and I have no more issues what so ever up to 145mph, I'm more than happy with the Hunter machine. I've had Yokoaham AVS Sport DB2, Dunlop Sports, Michelin Sport Primacy, Continental ContiSport Contact, and I always had an annoying vibration above 70mph.
I will say that the balance was free because I work at Jaguar dealership. If anyony in the immediate area needs wheels balanced, (Philadelphia area) let me know, just tip the mechanic like $20 and he'll do all 4 and balance them to zero for you.