I've seen a few clever ways authors reconcile an honorable Lung and the rape farm thing. My favorite one's involved:
1) The ABB had stripper joints, where management didn't care if a girl took a client home for a "private" lapdance, and the whole "rape farm" thing was a rumor started by someone (probably E88).
2)Where the gangs that Lung took over and formed into the ABB *did* have rape farms, but Lung put a stop to that right quick the moment he took over.
In the second scenario, one example that sticks out to me was one where Taylor never ran across Lung giving his "kill the kids" speech. So, Lung catches up to the Undersiders, and just before he flambės them, Tattletale blurts out something about the rape farms. Lung responds by grabbing TT by the neck and tells her he forbid such things in the ABB. Tattletale then tells Lung that word on the street is one of his Lieutenants has started one up. Lung promptly drops TT and leaves with a "let this serve as a lesson to you", and promptly goes to free the victims of the rape farm and burn it down with the lieutenant inside.
Wish I could remember what it was from though.