Yep just me and my confirmation bias. Unfortunately, my confirmation bias lost the argument. He wanted to find the cheapest solutions, I was committed to spend whatever it took to get the sound I wanted. Including the purchase of the Goth I have about $1000 in this bass and countless hours of effort. About $500 of that was in dozens of pots, caps and switches used in the test rigs that didn't make the cut and never made it into the bass.
As an Engineer who spent an entire career in the R&D Scientific community I'm very familiar with proper blind testing, I'm also very familiar with just how easy it is to guide even that type of testing to the conclusion you want. I've seen it done many times. Unfortunately human perception does not necessarily align perfectly with instrument bench testing. That's why we have bench testing, so we can get accurate and repeatable results that help us make better predictions.
If you want verifiable data use instrument testing. If you want to find what sounds best to your ears, use your ears.