2 damage is quite enough, 3 is oppressive. The difference between 6/9 damage a turn and 4/6 damage a turn is VAST. Assuming you hit a 3 row board, you're on 27 points in 3 turns. That is too much, and it's very easy to force people into long rounds and/or build decks that can force row stacking (either through movement or spy playing). There's a reason the change was made and it was a good reason.