Changed the stock vintage pups in my JO5 to a set bartolini 5J HC. I really enjoy bass more now. To my ear, the vintages are too mid heavy, running it with my TH500, which is mid heavy too, was too much. Sounded like I lost bottom end, but not with the Bart's.
glad you like the switch!
each of us has a different ear.....and that is a good thing!