Are those pickups on the 4005 surface mounted (i.e. not routed)? If so have you ever thought about modding it with an additional toaster or higain pickup in more of the 4001 bridge spot? I was just thinking that there might be a trick way to mount one there without drilling, and run the wire along the edge of the guard and into the bass using the hole under the existing bridge pickup...
I know its not a stellar idea doing any mods to it given the monetary worth of an unmolested one, but then again if it would help bolster the mids to the point where you would actually get some good use out of it...