These are two possible nerfs for high-end throwing weapons, specifically at the Throwing Axe level and beyond.
1. Slower animations a la archery nerf.
2. A Wallace proposition: heavier high-end throwing weapons.
The lesser throwing weapons don't need a nerf, but the first proposition would affect them, too, and stat tweaks might fix the issues with them.
A simple doubling or tripling of the weight should effectively slow high-end throwers down, giving them a serious negative to what they do. Lances in this system, on the other hand, should weigh at least 12 per stack.
All these, of course, have nothing to do with realism, so don't bring those arguments here. This is about balance.