sorry pal, your HIDDEN order qualifies you for a free lifetime sub to Elite Trader, but little else.
What do you mean posting behind the hidden order? I suspect they will print at a price to screw you if they can, unless you're lucky or they can't help it.
I've damn near given up even buying on the bid, a tactic that used to work well. You only get filled if its the shit, and never if its' going higher. Talking short term stuff, obviously, you can get hit, and the stock can be higher 15 minutes later, but rarely 1 minute