My SB-1 has Roto Bass nickel-plated rounds which are warm rather than aggressive. Also pickups are nice and low, with the pole pieces tweaked to add a bit of definition. I treat 8 on the volume knob as 10, with the stretch from 8–10 as a way of adding a treble+bass boost when needed. I also have the tone knob bobbing around between 5–10, depending on context.
Offering this as advice to an SB-2 owner has two fat problems: firstly, the tone knob is doing a lot of work; secondly, there's no getting round how close that single coil pickup is to the bridge.
So, ignore this post