Thanks for your reply.
I wouldn't say my bass suffers from a bit more tension (in fact it proved the contrary), the top has a good curvature, it's not sunk at all, and though not overly thick it's not at all like one of those instruments which look like they would crack just by looking at them. It's like one of those new "9mm/1cm instruments" in their thickest top spot, if you know what I mean.
What leaves me a bit dubious is that they chose to add some sort of "side braces" on the inner parts of the ribs (parallel to the soundpost, I mean), I'd say two for each side on the bottom part and one over the C bout, if I'm not wrong.. they'd surely prevent the sides from warping, is that extra wood really necessary, though?
BTW, I'd personally go for a mellower, deeper and more robust kind of string than the Flex 92s the next time (they weren't my choice on that bass), a model you'd associate with "the orchestra sound", also because that bass is very young and rather bright for now.
That set of Flex sounds quite evenly when tuned up as solo, when tuned normally my feedback would be, from top to bottom and referring to my standpoint while playing:
G - A bit harsh at times, especially the open note. Acceptable, anyway
D - Quite warm and resonating, light-gauge feeling. The best sounding string
A - The worst. Thin, little body which "starts" later than the attack and anyway still sounds nasal to me, gets very scratchy especially in fast passages
E - Quite full sounding and resonating, way better than the A string... still a bit floppy and light-gauge in terms of feeling... we're talking of Flexs anyway!
So it seems that strings tend to sound better alternately (D and E), with the worst one being by far the A and the G being a bit harsh at times.
Recently, during an orchestral rehearsal, I asked another bassist to listen to my open strings some 6-7ish meters away. She said she heard them way more evenly sounding and less problematic than what I feel and fear. Still, they were long, open notes and I don't really like the response I get when I play at all when it comes to the A string.