Release velocity does more work than angle
Of the three release parameters, velocity is by far the largest contributor to distance. A small gain in how fast the shot leaves your hand outweighs a similar-sized gain in getting the angle closer to ideal. That's why the legs and hips, not the arm, generate most of a good throw's distance: the glide or spin builds velocity that the arm and release angle then direct, rather than the arm creating speed on its own. Throwers chasing distance by only fixing release angle are usually optimizing the smaller lever.

