Great story and info!
If you love to tinker you've gotta try different types of strings on your VP Bird. The pups on that bird are incredibly responsive to different types of strings, more so than just about any other bass I own. Cobalt flats on a VP would make a killer Country / Classic rock machine.
I have Chromes on it right now - They're a great first shot - really bright flats. Love them, but they're pretty tight. I was thinking of trying a set of TI Flats, as they're what's on my fretless, but I'll give those Cobalt flats first. I know what to expect with TI flats - almost sloppy floppy - which works well with my playing style. But then - on the T-Bird... not sure they'd be the best match.
Here's where it's good to have different weapons at my disposal. Usually I try to limit myself to 2 basses for any one show.