The damage changes seem a little over the top. I don't feel like the damage change should affect throwing, at least not as much as compared to bows and crossbows. Crossbows have it a little easier off with a static reticule, but still, I'd say that if you're going to make accuracy more important, headshots key, you ought to revert the missle speeds to to previous or Native values.
With throwing your reticule doesn't really get as tight. Getting a headshot is already more of a crap shoot. Maybe decrease headshot damage for throwing slightly, and increase it for body a bit more than crossbows and archers.
Also, out of curiosity, do these damage changes affect shots against horses?