So I have a few questions from the video and I can clear up some of your assumptions.
First, the bearings are not broached by VEX afterwords. They are broached by the bearing manufacturer prior to hardening and grinding.
Second, the first shot in the first video I don't really know your setup so I can't comment on the wobble. In the second shot are you saying there is wobble in that video? In any case , please contact customer support and we can get you replacement bearings. Please be sure to give them your order number.
Third, the shield is a completely different part from inner race and we used a standard fr88 bearing shield.
Last, the absolute best way to get customer support from VEX is to call the support line or email
support@vexrobotics.com
I assure you that the bearings are supposed to be ABEC1 and not have wobble like you show on your video. We use these same bearings in our single speed gearboxes and we do not see this issue.
Please contact customer support and we can resolve this issue.