Redwood Bow would be the new Magic Bow. This means that for bows to arrows:
Regular - Bronze
Oak - Iron
Willow - Steel
Maple - Mithril
Yew - Adamant
Magic - Rune
Redwood - Amethyst
Possible crossbow adjustments for stock wood:
Bronze/Blurite - Regular
Iron - Oak
Steel - Willow
Mithril - Maple
Adamant - Yew
Rune - Magic
Dragon - Redwood
A larger revamp of levels/stats and white/black bows/cbows would be ideal. But this suggestion is just a basic progression change.