One of the hardest parts of editing is to "leave well enough alone." The reason there are only a few changes at the end is that, yes, I could rewrite the entire block of text, but it's well enough. 

I particularly like the last sentence, which suggests a follow-up article. 

You've written this paper at a high level of English just remember that the Journal will most likely re-edit it before it's published. 

Overall, I thought the paper was outstanding.