CrashClint
I Play Bass therefore I Am
Look at the Bart's, are they wired parallel or series? If they are wired series measure the ohms and see if you can get Gard to measure a new set to see the difference if you have a curious mind.
And again, this is not an Aguilar vs. Bart thing, as I really thing there is something weird about those Barts that were in my Century 4. I'm mainly excited now that this Roscoe sounds like a Roscoe, as I was really worried that I bought the wrong one of the three Roscoes I was looking at so now that puts my mind at ease!

