BadNewsRef wroteYou need to help set the tone for your association. You shouldn't be waiting for guys to tell you what is acceptable.
This is what I like: Clock winding down: One finger; I've got last shot: Chest bump. Plus, the chest bump is IAABO approved.
I don't like the head pat (not that anyone would be confused, it's just already an approved signal for something else).
Just want to see what's out there before I make my move.