Ok, I have a problem with the Angular momentum. Whenever your ship is turning, trying to fire will mostly result in a wild drag caused by angular momentum.
My problem is, yes, angular momentum would drag the projectile, but if the turrets were fixed. However, most likely, the enemy you are trying to shoot at would require you to turn the turret to the opposite direction; for example, if the ship is turning towards left, most likely you'll turn the turret to the right to keep up with the target.
Now, these both actions should cancel the angular momentum. Well, not entirely, since inheritance is based on the center of the rotation, and since turrets aren't located at this sweet spot, there'll be some conservation. But right now, the angular momentum "inherited" by the projectiles feels like you have a veeeeery long ship, and the turret is on the opposite side of the rotational axis.
This is why, in my opinion, rotational (Angular) momentum conservation should be minimized, but not completely eliminated.