I've had an odd Dunlop experience too. I bought one of the last Frudua Tuscany Swing (Fender Jazz Clone) bass's that were being talked about here just before this last Christmas. It came with a set of Dunlop's on it. Try as I might I just couldn't get myself to like them.
I then switched to my Normal DR nickels and had a let down, still didn't like it. Then it was my "cheapo" fender nickel plated staineless strings. I usually love the DR's and the Fenders but I just wasn't into any of them on this bass.
It sat un-played for months and I was pretty much regretting the purchase. Contemplated selling the bass many times. On a lark, I removed it's stock preamp and pickups and put in a set of pickups from a MIM jazz. Added CTS pots and a orange drop cap and strung it up with the Dunlops it came with and HOLY CRAP!. It sounds awsome! I used to sound sterile and dry, now it rings and bumps like it's supposed to. Go figure.
Iit obviously wasn't the strings holding it back before, and I'm not saying they are the bees knees but for this bas they don't seem to take anything away from it and they are comfortable to play.