If I'm not mistaken they are hub-centric. I have them on my hub-centric spacers. Absalom has the right idea, just wrong lug nuts in mind. You need to use the OEM mag seat lug nuts with washers. They will center your wheel on the hub regardless.
Back when I had my LC80 wheels (which are hub centric as well) I had to use tapered style lug nuts, which I never liked. When I changed to the LX450 wheels they tried using the same lug nuts and they weren't cutting it. It wouldn't seat the wheel on the hub right and causing to much play.
here's what I mean
My guess, unless you're using the wrong lug nuts, they just screwed up somewhere...
BTW, what do you mean by using the hub-centric adapter?