This band is a 4pc with gtr, keys, drum & bass, with the main focus on the guitar since Chris Rea was guitarist and front man.
Up to now with this band, (two gigs and a number of rehearsals), i have more or less settled on having both filters at about mid point and no Q, pickup volumes biassed towards the neck, and only changing things for a couple of tracks which have a more bridge pickup bias and a track that sounds like it was recorded on fretless.

I take your point Jimmy and not planning to make bi-amping my norm. I'm just experimenting since i have the opportunity to scratch that itch. 🤣

The sound guy will just have the mono Di feed from my F-1x so the bi amped sound will just be for me to hear. Though i did wonder if this being an outdoor gig will make my hearing of the effect less due to lack of boundry re-inforcement, hence me considering using the 18" speaker cab.

Hey Jazzy, biamping with those cabinets may be a revelation. Letting the 18 handle the bottom octave or so will quite likely be something akin to a religious experience.

The genius of all this was you could just keep cabling, amping and cabbing to wherever you wanted to end up.

F2B, left out to an amp and cabinet, right out to an amp and cabinet.  Not enough?  Just keep jumping amp to amp and add as many cabinets as you need.  Then with a Series 2 bass, set the blend of the two pickups and turn everything up and down via the master volume on the bass.

Or you could repeat the above layout for real bi-amping, not just dual amped as above.  Simply include a crossover'd power amp on each pickup's send (a power amp with a built-in crossover would save time here), and two-way biamp each pickup.  Holy Smoke.

That all this was designed in back in the 70's is amazing.  Today with Class D power, neo-speaker'd cabinets, or IEM's, it may seem like overkill on today's stages, but OMG what this is capable of.

Jazzy the real advantage (if it's worth it) in running each pickup to its own amp/cabinet is that you can tone control each pickup separately.  You'll have to decide if whatever difference you hear vs. summed mono out is worth it to YOU.