Mully, I see what you mean about back up. I'm curious though. At some point you have to decide to pick off the back ups. In this case are you just keeping all 5 balls until last and deciding then?
I don't think you would be alone in that thought, because I don't think most of the pros think that far ahead. And chances are, if the balls are spaced nicely and grouped together and out of the way like they are here, you'll probably be fine to land on the break ball properly.
Oh yeah, and what about the 15-ball. Are you concerned about it being in the midst of your triangles?