Standover is one of the last things I'd look at when evaluating a frame. My FS bike has a sloping toptube which is crotch height or higher for most of its length. I've rarely canned myself on it. When I did, it was typically a crash situation.

Is your hardtail too big? Dunno. Do you feel stretched out on it? How long's the handlebar stem? Can you maneuver it well on technical bits? These are more important than standover IMO.