Yep, my good suit has 94% DI without a weapon in hand, so anything more than 6% DI on a bow is completely wasted on me. It saves me a lot of gold when buying weapons, as most people think that DI is mandatory for a weapon.
If you want to use it, just make sure you have stormgrip, library talisman (or conjurer's), and DI on your ring and bracelet, and you'll be fine. Or use a slayer talisman and EoO and you're at 300% DI (the max) without anything else. My favorite weapon is a crossbow with repond slayer and no other mods. With CW, LS, EoO and a GM suit of armor (no additional DI), I can one hit kill arctic ogre lords every once in a while. The rest take two hits. You can get the same result with that weapon and an ice slayer talisman.