I agree with JanMM, you're probably still adjusting. But my opinion, after looking at your pictures, is that your seat may be a bit too far back. At least for me, I wouldn't want my legs quite that extended. I would move the seat just a tiny bit forward.

I am speaking from the perspective of my own knee problems which are probably very different than yours. So I don't want to sound like I know what I'm talking about.