There's a world of difference between achieving tone in a studio and doing so in a live setting. No offence to the OP, but you need a considerably more sophisticated rig than a Rumble 500 to do it at any sort of volume and even then it will be masked/affected by what else is happening when you play in a live band. You don't even hear the true onstage sound in live recordings such as those above - the multitrack will have been re-eq'd/tweaked before release/screening. T-Bay's comment above is very true - what sounds great soloed doesn't necessarily work in a band context. Trying for that holy grail tone is a hiding to nothing, I'm afraid. It always amuses me, for example, that people revere the Ampeg B15 "because Jamerson used one". He may have, but only as a monitor so the studio band could hear the bass. That lovely recorded tone of his was created via a custom built preamp running straight into the board (see various YouTube vid's on the topic).