The pickups on the TRBX are an odd size.I don't think the pickups on the TRBX are P2 sized. They are close but, when I measure them, them seem to be a few mm different.
I'll have to re-check. If I can swap the electronics without routing, that might be an option.
The other thing about that bass is that operating the EQ knobs seems to be different than other basses. On others, we typically start with all the EQ knobs at detent (centered) and then adjust from there. On the TRBX I found that I could start with everything boosted, then cut frequencies to taste, or inversely, cut everything and boost the knob that controls what's missing in the sound. String selection and pickup height also was a major factor. The way to dial in sound is, IMO, just not "industry normal".