I don't know how balanced he is on PC, but I'm so over Soldier on consoles at this point that he's the only character I genuinely, without joking, want to see deleted from the game.
19 damage should help, but I would also take away some of his healing station. Maybe give it a greater CD or significantly lower it's heals per second. It's so frustrating when you get him almost down to zero and he pops the station and gets ALL of it back in a few seconds
Edit: actually, what they should do is make it destructible. It will give the enemy a solid chance to counter it instead of just being "Lol, fuck yo damage"