Ah, now I get it. They came assembled and I never took one a part. There is definitely a washer between the bearings but it must not be thick enough compared to the ridge in the middle of the wheel (I didn't know there was a ridge there, but makes complete sense it has to be there after I think about it, how else would the wheel be captured). So ya the ridge being thicker than the washer between the bearings means tightening down will pull the inner races closer together than the ridge in the wheel allows the out races to come together causing all the issues. Someone else mentioned using the 5mm washers supplied to replace the washers between the bearings in the wheels. I'll see what's up with mine tonight. I might have some shims from my RC stuff that will allow me to fine tune it, if not I'll be doing some looking around tomorrow after work.