Hello. I would like to upgrade the pickups in my American Performer Mustang bass. I am thinking about a Nordstrom NM4 in the neck position, with a NJ4SV in the bridge position. I am primarily a guitar player and am much more knowledgable about guitar gear than bass gear. The best way I can describe the tone I want is "old school" and "deep". With the stock pickups, I usually play 50/50% - 100% in favor of the neck pickup. LaBella flats. Any thoughts or suggestions? Many thanks!