I tell the 6s that a long hang pull-over should feel similar to the L4 backward roll to push-up. Instead of pushing against the floor, they need to pull against the bar to lift their shoulders and flip their hands. We don't let the 6s do the pull-over right away; that encourages the piking and dumping over. They start by getting comfortable with doing a small cast into a swing, and once they're okay with that, they begin to get more aggressive with the tap and start to do a small cast to a lever (it goes a little past a lever... basically they get to a straight-body inverted position) to try to get the feel of pulling on the bar. After that, we spot them from a 3/4 HS to a 3/4 HS, and once they can do that well, they're allowed to do the baby giant into the underswing. (They should be doing giants on strap bar at this point, too.) It should be a continuous swing rather than a slam and pike onto the HB, then lift the chest, then underswing.