As a general rule, you should use the 'comments' stage, to point out any holes in the operator's evidence, anything within it that reinforces your case, and anything in it that weakens theirs. If you've made a point in your appeal that they have failed to address, point this out. If they have made a claim that is not backed up by their evidence pack, point this out, etc. etc.
It would be useful to see the document but, like Nosy Parker, I also have a day job and will have little time to pour over such a large document in any great detail. We potentially don't need to see all 211 pages, but as we don't know what pages contain what, it's hard to advise on what would be useful to see.