I don't have anything else to add to this tracking except that I want to let you know I admire this type of effort in recovering an animal.
Too often we hear about the guy who spends a couple of hours and then goes back to hunting. I don't see where you have done anything wrong in the shot or the tracking. If this deer lives or is dead you can at least be proud that you took the time to do all you could in the attempt to recover the animal. The experience that you have got from this is what is will help you in the future.

Good Luck
Jeremy

" Anyone can be a father, but it takes a real man to be a Dad"