This looks pretty strong! One thing we all need to be on the lookout for are unclear pronoun references. Often we use such words as "this," "that," and "which" without making exactly clear what those words are referring to. I noticed this problem (I almost said just "this" right there), so you may want to go back through your paper and see if there are any instances of this kind of difficulty. Notice how, in the preceding few words, I wrote "this kind of difficulty" instead of just "this." It is often tempting for us to use just the word "this" without making absolutely clear what "this" refers to. The same kind of ambiguity is often associated with use of the word "which" by itself. You may want to look to see if you can make the referents of some of your "which's" clearer. Good luck!