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Thanks for all the detailed responses! Yes I have the tone on my basses all the way down. Only on a few of our songs do I actually go with like a “2” on the tone.
Btw, we also tune c-g-c-f and that westone is still too bright with the geezers and stock emg wiring.
Like I mentioned before, rolling off the tone won't really do much if you've used the GZR solderless kit with it's .022 uF tone cap. I think you might like the GZR pickup a lot more if you replace the tone cap with .047 uF, or maybe even .068 uF for an even darker/beefier tone. Replacing the tone cap in the GZR kits isn't easy though. Unless you're comfortable with soldering tiny surface mount components it's probably a better idea to replace everything (except the pickup itself) with traditional P-bass wiring.
But I also suspect you might like those Lollar Precision 90s even more. They won't sound like a Gibson but they definitely have a hint of T-bird "heft" in the low mids. Probably as close as you're ever gonna get to a Gibson'ish tone with a split coil in the P-bass "sweetspot".