As in most things ergonomic, a human tendency to do a certain thing over and over perhaps points to a good thing.
Back in the early 2000s, a fellow showed up with some seat-of-the-pants research that demonstrated that if properly supported, a cultivated slouch could be the best way to endure at a keyboard. He came up with a design that supported your arms at an angle on your desk and encouraged tilting back -- or slouching-- thus opening up your spine, and encouraging shoulder and back muscle relaxation. He called this "The Butterfly Board." I reviewed a couple of his prototypes for a publication, and, outside of being a bit large and clumsy, they worked like a charm! I was able to recline my chair back slightly, take the stress off my back, support my shoulders and upper back, and key away. However, the fellow passed away, his estate apparently did nothing with his design, and now it's just a footnote among ergo researchers:
https://ergoweb.com/forums/topic/good-or-bad-arm-supports-such-as-arm-boards-metamorphosis-board-versus-desktop-worksurface/You'll notice, though, that there is actually a consensus that this leaning back, or "slouching," could actually be a good thing!
Here is a picture of an iteration of the board that wasn't quite as good as the original, but gives the general idea:
http://gcn.com/articles/2003/07/09/butterflyboard.aspxSo. Here's the upshot. I've been working on a re-design of this board, if for nothing else, to provide me with this comfort again. A friend has put together some good woodworking tools to put these ideas into an actual piece, and I hope to have one in place soon. I'm sure that if any of you are interested in one, he could be persuaded to knock a few out!
So...don't put yourself down for your slouch position. Maybe call it "The Recaro-Formula One Position," or "The F-18 120-degree Cockpit Seat" or whatever. All-in-all, I think you can infer that slouching is not such a bad idea!