In this thread you see the impact it has vs Valla. I do know valla has low health but its mostly % dmg he does.
You dont need to kill a tank solo. Tychus should be neir his tank. You rotate together you kill together
He is at 4.5 range. So if you try to stack smart tanks will use that against you. Thats why you cant do much on your own
The trick with tychus is dont be a hero but react to your teammates who have CC