Given the place throwing knives are in right now, we are downing their offensive bonus.
Throwing spikes were always meant to be the best projectile, but it would take effort to acquire them. As it stands, throwing knives had the same OB and a bit less damage than throwing spikes, but MASSIVE availability. Like, comparable to throwing axes, which was deemed a problem at some point.
To give players a choice, we have changed throwing knives to have lower OB, but higher potential damage in a larger spread than throwing spikes. Their loads remain the same.