I find at lower volumes it does not matter how much you add, the percussive sound is not there because you are not moving air.
Bingo! That's why it's all part of playing the rig, not just the guitar.
Low frequency sound simply has more capacity to move air in such a way that provides that percussive thump on low-note chugs and such. At one point in the late 80's, I played through a custom cab that had a high-watt 18" subwoofer with a cross-over built-in. I've never heard another guitarist, pro or amateur, that could get the kind of ridiculous heart rhythm-altering low-end thump that I got with that bad boy. Even the modern Mesa cabs don't even come close. In fact, it ended up being way too much, and my bass player became almost unnecessary, and of course I mean that in a really bad way. Sure, it sounded cool and powerful as all hell, but in terms of playing with a band, it was a nightmare. At the end of the day, a guitar is not a bass nor a kick drum.
Still, even to this day I still like chugs that you can feel as much as hear when playing live, and that's all about moving lots of air quickly.