Cool!
Most of the Mesh looks excellent!
There is bit of an issue here (on both sides, but this side is the worst):

In Edit Mode it reveals twisted Faces:

Can be easily fixed by Scaling the Faces to 0 in (Local or Global!) Z.
I lifted the Edges a bit afterwards to follow the contour of the top, but you can also make both flat of course.
Then I’d prefer to have an Edge Loop here (like you have everywhere else), You can use the Knife tool:

I used Cut Through, but therefore i had to ‘hide’ part of the Mesh. My favorite way to do that is, box selecting what you want to see with ALT+B.
The result:
