I have a MIM P strung with Labella flats that I primarily use for surf. The stock PUs are OK, but I just have this sense that I could do a bit better. They seem to have an aggressive upper mid honk that's somewhat hard to dial out without going completely to mud. I play this bass with a pick and do roll back my tone control quite a bit. Anyway, I'd prefer PUs with a bit more growl and less honk if that makes any sense. Something with a low mid rather than high mid emphasis. Fender '62 maybe? Fralin?