Caucasian_AsianUnless you know what you're doing, don't fuck with your bindings PERIOD.
"Don't wiggle around"? Really?
The height adjustment on the AFD is not an adjustment that could cause the binding to critically malfunction and not do it's job. To prove my point, there are plenty of excellent bindings that don't even have it, axial2's and fks for example. It is just meant for people to be able to fix up-down play in toe piece because some boot soles are thicker then others (thin full tilts vs thick race boots) and many people were beginning to not like the fact that they could feel their boots chattering in their bindings. So yes, it is meant to make your boot not wiggle around in the up and down direction and properly contact the rollers in the wings.
I did clearly state that it's a bad idea and you shouldn't adjust bindings yourself, but that the information I was giving OP would be what he needed in the case he chose not to take it to a shop. I figured, I would rather him know the proper information rather than find incorrect information and then wind up screwing himself up.