I agree that sticking it out can sometimes help. The Embody is very punishing if you slouch (the hard sacral part will just dig into your spine), so the first step would be to make an effort to maintain correct posture. But if you're sitting straight AND still feel discomfort, I'd say the Embody is not for you.

About the reclining, yeah -- Herman Miller would probably say that the chair isn't meant for active reclining, but that's no defense. Sometimes I like to recline at more than 120° to relieve the pressure on my spine (for example, when I'm not typing but for example, watching a YouTube video). I prefer chairs that allow me to do that (e.g. Steelcase Think/Leap/Please, Humanscale Liberty). The fact that the absence of this feature was a design choice by Herman Miller doesn't really change my appraisal of the product.

Funny you should say that the armests sit too far back. I had the opposite problem: they were always bumping on the edge of my desk, so I had to sit further from my desk than I would have liked. And I'm not the only person who had this complaint. I guess everybody is different.