I'm out of my league on trajectories. Never really used trig and never fired artillery. That said, I thought the whole launch angle stuff says the ideal trajectory is in the low 20s (degrees)?
In a purely Newtonian world, 45 degrees is the optimal perfect parabolic arc for maximum distance. In the real world with things like wind, drag, humidity, temperature, etc. 25-30 degrees is optimal because while it will go a shorter distance overall, it will get there faster and therefore be less likely to be affected by any of the negative (or positive) factors. It keeps the ball high enough that an OF can't snag it with a lucky catch, but low enough to get out of the yard fast and not hook foul (or be blown by wind).