It is similar with Tora.
I have her at 2lb now. She does good damage 400-450% even without the extra damage if minions a present.
That extra damage, up to 800%, looks good on paper, but is difficult to achieve under normal circumstances.
In addition, even if there are many minions present and the damage does go higher, most of the damage goes into killing the minions, so you just end up with a minion killer special, that does just little extra damage on the actual enemy.
So, stronge hero but not really a one-man match winning Maschine.
See example here: