It's 5nl, so I'll take my chances that just about any passive player is someone who tends to call too much.

Your static Button ATS number is irrelevant. Mine is higher than that, but I'm not stealing any more than like 32-38% here (mine is really inflated by min-opening ATC when there are two weaktights in the blinds). I'm not kidding when I say that 54s is at the very brink of our stealing range here. I wouldn't have really batted an eye if someone said to fold it pre.