Re: increasing bow damage with OCV levels?
spelling it out a bit
if you have bought 3pt skill levels for your bow, then yes, you can make them do more damage with your bow.
If you have bought 3pt skill levels for your sword, then no, you cannot make them do more damage with your bow, but you CAN make them do more damage with your sword.
If you have bought 5pt skill levels for Ranged combat, then yes, you can make them do more damage with your bow (or any other weapon used at range).
If you have bought 5pt skill levels for Melee combat, then no, you cannot make them do more damage with your bow (or any other ranged weapon), but you CAN make them do more damage with your sword (or any other weapon used for melee).
If you have bought 8pt or 10pt skill levels, then yes, you can make them do more damage with your bow, your sword, your foot, your fingernail clipper, or anything else the GM says ok to.
Hope that didn't sound condescending, but just trying to cover all the bases!