OS is designed to add an effect on first shots from a bow.
Longbow and shortbow both have a 1200 range but OS is limited to 900.
Longbow by design gives best damage at max distance, so forst shot ideally is always at 1200 (or 1500 traited into Eagle Eye). So if I shoot the weapon as designed, I will never see the benefit from OS.
Methinks that is broken (logically if not practically)