If you have HEM, go to the report tab, click filter:

more than 5 players.
filter by action: raise
more filters: In BB and Steal Attempt=true

If that is really the range you 3-bet to a steal, I'd be surprised if get a positive number there, because not only are most of the hands you 3-bet behind a 35% range, you're also OOP for the rest of the hand - and especially HU position is so much more valuable. This is the main thing you're missing I think. When somebody raises the Button or CO, he's not only betting his hand, but also his position. It makes sense to raise a wide range from LP simply because you'll get to act last on every street.