I'm going to state the obvious. Either the RWC inner ring is not within spec or the suspension bolt isn't. A digital caliper should be able to tell you which one. Based on your video it is defiantly too much play. I have the same RWC bearing kit, and a suspension bolt (8mm) from a new HongFu FM258 frame. Zero play.
From my understanding the different RWC inner ring sizes(-,+,++) have to do with the outside diameter, not the inner. The inner diameter is the same for all inner rings. The most likely culprit is the suspension bolt, since you are getting play in all the inner rings.