This is a good steal.

Flop:
You said you steal alot. You should tend to jam the flop when you steal. Since you will be stealing from the same characters often they will be used to your insane heads up flailing. Such an image may allow you to cap the flop here.

Have you read the section "What you must realize" in Advanced Players? Blind steal is the closest one gets to heads up play in a multiplayer game (besides SB vs BB). If you switch gears from tight aggressive in the normal game to maniac in the blind steal, you get deception plus sound strategy.

In summary, cap the flop if BB is any non-passive.