If the Nailbomb is a bit dark in the bridge and you want something to match it, why not think about a Black Dog? They are on the hotter end of the vintage side and seem to be darker than the Cold Sweat that was previously mentioned. :)
Keep in mind that the Nailbombs are pretty dark-sounding pickups, even in the bridge position (though less dark than in the neck).
I have a Miracle Man paired with a Mule... No problem with the output mismatch there
Don't know the resistance but was bought as a calibrated set.... If this means that the Mule was wound hot then apologies!! :P