I am a neo-sporin fan personally, but generally only for the first 3-5 days, then let the wound dry. You can use a product like SWAT around the wound but not on it to decrease flies. You might even forward your excellent photos on to your vet to keep in his file, and get their input on the healing progress. But it appears to be on the right track for healing via second intention. Will just take some time due to the width of the wound.