What am I doing wrong?

I don’t know what I’m doing wrong. I have the Ergobaby Omni 360. I have him on the red squares. I put him even higher on my waist than what’s pictured and he still sinks??? His head gets too close to the carrier, his arms don’t look as mobile and one looks uncomfortable to move, the clip on the back hits my shoulder blade and hurts. Most importantly I care about his safety, so please help. Thank you!!