yeah your right with the whole 67 and Q 4 thing but what you should really be worried about is the player not your hand when stealing. Factor in their ranges, and their ranges in each different pos. Also factor in the type of player they are, for ex: tight/passive, tight/aggressive, loose/aggressive...and so on, you should be able to steal from a tight/passive player with ATC imo
And even if they call, they are out of pos. and outplaying a tight/passive who is out of pos. is too easy.
Another thing to think abut when stealing. Make sure not to steal at the same spot on the same player all the time. They wil defend eventually no matter what type of player they are. Basically just pick your spots.