Floor traders make money by exploiting the bid-offer spread, being able to front-run institutional order flow, and reacting quicker than off-floor traders. That's it, pretty much, for almost all of them. The majority of floor traders become net losers once they go off the floor.
ACD is basically worthless IMO for any off-floor trader. It's also a cypher for floor traders. Just be on the bid in strong markets, and on the offer in weak ones. Fade sentiment extremes once stops get triggered. Know when a market order is almost done, then fade the order. That's pretty much it.