Posted 17 March 2017 - 12:04 PM
Another big P bass/flatwounds fan here.
Mine has been strung variously with La Bella 760FL flats (nice tension, similar to 105-45 gauge rounds) or occasionally Daddario EXL165 nickel round wounds.
Both have plenty of warmth and thump - flats better for the sound you're describing, but rounds arguably a more versatile all-rounder.
Don't be put off by price of flats tho - you won't have to change them for years, if ever, as they don't go dull the same way as rounds. They also feel smoother and more comfortable than rounds, and have a fat thumping low end you won't find anywhere else.
I've only tried La Bellas (great sound and feel) Thomastik Infelds (great sound, tho tension is a lot lighter) and Rotosound Sm77s Monels (quite stiff).
Like everything else, there's an element of suck it and see, or try them out on other people's basses if you get chance. There are sometimes used flats for sale on Basschat, which is a good cheaper way of getting to try some.
View my feedback here: http://basschat.co.u..._1#entry2973577
Instruments: Fender 1970 Precision, Mike Lull PJ4, Epiphone Jack Casady, Yamaha BB604, plus some electric and acoustic guitars and harmonicas
Amplifiers: Aguilar and Schroeder cabs, Markbass and Fender amps
Other: Various fingers, thumbs, tapping feet, nods, winks, desperate facial expressions and often wildly-ambitious cues to the drummer…