I think I get you, John - thanks.
It sounds like the little hop as the CB hits the OB when a skid happens. My guess is it's the same cause for both things: the balls "stick together" for a moment because of chalk (or something) between them, causing the CB to climb up on the OB and the OB to throw more than usual. You might not notice the little bit of extra OB throw if the shot is pretty straight.
Here at my local pool room they use Centennial balls with the blue circle CBs that come with them. I use my own red circle CB because it has a glossier finish and collects less chalk dust (so fewer skids/hops). I also have a measles CB that I like, but it's newer/bigger/heavier than the old ball sets here, so I usually go with the (older) red circle.
Those are my two criteria: high gloss surface and matched size/weight with the OBs.
pj <- and, of course, as round as possible
chgo