Nicely stated.Pretty much all Gibson volumes have been 300k linear for the last 35 years. Counter-intuitive as it may seem, in the passive guitar volume arrangement linear gives a much more even fade from about 10-2, especially when balancing neck and bridge in the middle position. Then it cuts out fairly rapidly from 1-0. I personally prefer linear over audio for volumes, but I'm probably in the minority. If you're playing anything overdriven, the audio pot offers the quick clean-up fade from around 10-7, then a slower change area from 7-3, then a smoother fade out from 3-0. Most people seem to prefer audio in my experience. Audio pots often get fit with a treble bleed cap or cap/resistor combo to keep the treble up as you pan down, yet linear pots don't seem to have quite as much need for it.
So switch to 500k and you'll get a bit more brightness / high end. You would still have the option of using linear or audio in 500k pots, and that's just personal preference. If you like the way your volumes work now, stay with linear, if you want the more rapid roll off at the top and a smoother fade out at the bottom, go with audio.