Interesting you have done funk gigs with your RA. My current project is going for what I would describe as "Acoustic Headhunters",....improvisational jazz that's heavy on the funk end of the spectrum,...but acoustic. I haven't seen many others using their RA for funky stuff.
I have a D800+,....anyway you could send me a snapshot of your favorite Rob Allen setting on your D800? I hate to sell my Mesa rig, because it sounds awesome with most basses, including the Rob Allen. But, it makes the Rob Allen sound like a nice, hifi, electric fretless. I can't get the RA to sound even remotely upright-ish with the Mesa (paired with 10" speakers, tweeters dialed back to the max). I've accepted that the Rob Allen will never duplicate an authentic upright sound. I think the upright string length/tension, and resulting right hand attack, is too hard to replicate on a 34" scale instrument. But, I would like the Rob Allen to sound somewhere closer to that upright spectrum, and the Mesa just sends me closer to the electric fretless sound. Maybe your settings could help me dial it in on the Mesa. I am particularly curious where you set your HP filter.