Don't rely to much on this OP. Most readers have their hands full. I PMed maybe 6-7 of the readers who were still accepting and maybe 1 got back to me. I suggest you email old english professors. Thats what I did and their edits were very helpful
That or pester your friends. If you know anyone applying to grad/medical school, offer to read theirs if they'll read yours. I had three or four different people edit mine.