ORIGINAL: Mode One
I feel all props should be checked for imbalance. Some people have a certain size, above which they feel they should be balanced. It takes so little effort to do, I just go ahead and check them all. I really don't pay attention to the hub as it is so close to center, I feel the imbalance here is negligible, unless really out of whack. How are you guys balancing the hub, you certainly do not want to remove materail?
I think APC props have a groove on the back of the hub. You could paint on fingernail polish like some do, a dab of epoxy, dab of ca, and it would not effect the way the hub fits against the engine plate. I am like you though, I just balance the blades.