Perhaps, but I need lots of water. I sweat a ton too. I got to the point where I didn't even carry water anymore and just planned my route around the various drinking fountains on my routes.
Ahhh, T.J., that would drive me insane! And I have a very short waist (only like 1.5 inches between my lowest rib and hipbone) so that would definitely happen to me too.
If you keep them off to the sides of your back (which it looks like from the picture, that's doable), then it shouldn't bother you, if you get the one with only two bottles, like Miss Dama is saying.
I had a Mizuna? water belt (bladder) long ago, and the first few months, it was great and didn't bounce. It sat at my lumbar, and I would even forget about it being there. But then it started bouncing, which sucked. Oh well.
