First of all can I say well done on rescuing this little one, and looking after 10 other dogs and their associated health issues, you're truly a wonderful person.
I would suggest that you stick with just one food, and of the two you use I would suggest Orijen (or similar 80/20 foods from the UK may save you a few £) will work best for him as the higher meat content and extra protein and fat is just what he needs (no need for it to be the puppy version though, that is just more expensive) I wouldn't bother with the added egg either as Orijen has all the nutrition required without adding extras, but that's up to you really. I don't think you would gain much extra benefit from raw over an 80/20 food, but no harm in trying if you prefer, or feed part raw, part 80/20.
A month isn't going to be long enough for you to see improved condition, his body is currently using the nutrition from the food to build muscle and repair any internal damage, skin and fur won't start to improve greatly until the core body functions are running smoothly, as these are more important to overall survival.
I would suggest that it can take up to 6 months in total for the condition to get anywhere near, maybe longer in extreme cases.
I hope you will keep us updated on his progress in the coming weeks and months.
Hope this helps