Call Becky Lawrence and order an L500XL. (Just Google "Wilde Pickups")
I like bass and hate too much treble and this pickup is working great for me in two very different guitars. I just turned my treble knob on my amp back a notch to let the bass and mids have their way.
Or if you already have the Dimebucker, get a graphic eq pedal. Cut the highs, boost the lows and/or low mids and then you have a Dimebacker with more lows.
Have you tried the unshielded version? I have one of each and I like the unshielded one better but i don't know if it's the pickups or the guitars they are in.