I'd use a few bait sets for change ups, but don't overlook post sets and gland lure at flat sets this time of year. If you have that much food supply around, and the coyotes are working the carcasses, you also have some territorial events occuring. Nine carcasses is a big feed station. My experience is some coyotes will trot right on by a dirthole sets to get to a carcass pile like that. But, many coyotes will want to be in the loop as to what other coyotes are also working their carcass find, too. A post set along natural travel routes and established trails to such 'dump' sites works very well. Change them up and use a non-coyote urine also such as fox, bobcat, or even mink urine. I've even had very good luck with just domestic dog urine at post sets, too. (I'm not kidding...)
Food may not always be on their mind if there is a lot of food availability in the area...but territorial markings are always of interest.
Anyway Tim, take it for what its worth. We always have so much driving, stomping, shooting, etc. going on during deer season around here. And, historically, every passing truck will also stop to shoot at a coyote. They seem to get a little high strung (at least moreso than they normally are) and I see noticeably less visits at my food sets after deer season. I am not a coyote nor claim to be able to read their minds...but I always thought that between all the activity in their territories plus the new food opportunities in gut piles, crippled deer, etc. that the new food must be correlated to my decreases in food set visits. But, my post sets, or any set that I have urine or a good gland lure at seem to still do well.
I set up near a pile of dead cow carcasses one season. Never had one food set touched that entire season...and I even tried switching to beef and beef tallow thinking I could "match the hatch" so to speak. Nothing. But I always make my sets in gangs of 3: one bait set, one post set with urine, and one flat set or at least a very completely different looking set. All about 15 to 20 paces apart. The post sets connected 75% more than the flat sets (and whatever other set that was non-food attraction). I also had some success with snares and blind trail sets at this location. Again, I never had a dirthole or food-lured or baited set touched that entire season in that location. And the mink and fox pee lured sets did equally as well as the ones with coyote urine or gland lure. Go figure.
Again, take that for what its worth, and I'm not an expert...but that was my experience when the "food supply was abnormally good" in a location.
jim-NE