ok I've ran into a lot of these types of problems before. What I did to get rid of that dent/slope/concave whatever you call it area was I converted to polies and carefully pulled the vertices out again then converted it back to SubD to smoothe it out a little. What I did for the areas was I converted to sub D then back to polies with more levels or whatever and back to sub D again. Then i changed the the sub D to ply option to lower polies and it fixed it. I'm sure there were tons of extra steps in there that wasnt necessary, but hey i did it? lol

And i feel like messaging sarah.