Need help fixing hull shape in Delftship Free (concave waterlines and misaligned bow/stern)

Hello everyone,
I'm working on a hull model in Delftship Free for my university project.
My professor doesn't want to explain to me how to solve these problems:
– Concave waterlines near the stern,
– Misaligned bow and stern edges,
– Wrong curvature at station 14,16,5
– Transom not perfectly flat,
– Deck line too high in the stern.

I need to correct these problems without changing the main dimensions.
Could anyone help me understand which control points should be moved or how to properly use the Fairing tool to fix these issues?

I can attach my .fbm file if needed.
Thank you very much in advance!

 

Start with a straight edge.