On the two Super P Dingwalls I’ve owned with preamps, with both the glock and Aguilar, I rarely engaged the preamp. And then mostly by accident.
I much preferred the passive mode.
The P tone pup, on the other hand, I rated as a “must have” option. If there was one available for my Dingwall, I’d install it.
If a P tone wasn’t an option, I’d usually rewire to series to move in the direction of the P tone. Bridge pups usually get rewired to series for more volume, and often the two series pups combined in parallel was the sweet spot for me.
I never bothered with series/parallel switches because too many options isn’t good for me. The single pickup Super P is right up my alley, I have trouble enough choosing between the scooped or regular side on the tone control.
The only active bass I have left is the Cirrus, which has no passive option. The three band eq stays at the detents, and I might roll the blend either way.
I’m still figuring out the three pup setup on the Dbird, but I sure like the bridge pup.