I can't help but wonder what would happen if I had a fully carved LaScala set up exactly the same way and with the same strings, but that's $10K or so worth of experiment right there. I did play a carved LaScala at the Aebersold camps and it was beautiful, but it had lighter strings and lower string height, so when I went from the ply to the carved I preferred the power of the ply... but that was only the setup and strings talking. That carved bass was gorgeous.
Hey, thanks Chris! I presume you are talking about my bass? Funny that you thought that the string height was low, because while I was perfectly used to it, my luthier, Jed Kriegel asked, "Why are your strings so high?" Then he lowered them a little more. This is coming in handy as I am moving into thumb position now...
Coincidentally, I am shopping around for a ply bass now, primarily for those environmentally challenging situations. The problem now is that since I have grown used to (and love) the sound of my fully carved bass, none of the plywood basses sound all that interesting to me. I will have to check out your bass again this July since it is its ply twin. Although, as you said, the set up is different...
I find the tuning of my bass does change with humidity, but once I get it in tune, it stays there. If the humidity doesn't change, it will stay in tune for a very long time. I don't know whether this is a function of the stability of the wood or the Sloane tuners, or both.
So now I am debating, as the OP is:
ply vs hybrid (for bad environments) OR just stick with the one bass I know and love.