Well, it all depends on the individual. First, I can't help every kid after every shot. We've got 4 coaches and 18 lanes. What I try to do is stay on one pair for a while, help those that want help, then move to another pair for a while and so on. I also don't have a problem focusing on just a few bowlers if they really need to work on something.
Not every kid wants help, some just want to show up throw the ball and have fun, so I pretty much leave them alone. The important thing is to make sure all the kids know you are available to help them and not that you will only work with certain kids.
I will walk down onto the lanes while they are bowling to help, no sense in waiting till they are done. Kids generally don't have the attention span to remember after the fact, so I get them while they are doing it.
It doesn't matter if it's coaching bowling or teaching someone a new software program, talking down to a person isn't going to get results. Obviously, if they are a beginning bowler, you can't get super technical and use all sorts of jargon, but you can still address them as intelligent young people and they will respond (hopefully).
--------------------
It IS next year!