Quick answer on the dry food charts. NO, on the dry food charts being available.
Dry food has more calories. So if you have picky yet chunky fur kids, taking them off the dry food can help them lose weight.
Losing weight is better overall, so you don't have more fur kids that develop diabetes or other health issues due to being overweight.
I used this document to get my DFAA (Dry Food Addicts Anonymous) cat off the dry food.
https://catinfo.org/docs/TipsForTransitioning1-14-11.pdf
Wasn't quick. Took a lot of persistence on my part.
You'll undoubtedly need to take your 9 cats off a free feeding schedule and change them to meal feeding. You'll be using their natural hunger instincts to get them used to food being unavailable all the time. Let them eat for 30 minutes or so. Take the food away.
Then, when your cats are used to meal feeding as opposed to free feeding, then you try to introduce more lower carb canned foods. There will probably be 1 or 2 that are more resistance to canned food. With 9, it's going to be harder to get all on canned food at the same time.
Not sure what your work/life/responsibilities are like. So you have to find a couple of times a day where you can meal feed instead of free feed. 2 of my cats were like "What took you so long to feed us the yummy canned food instead of this dry stuff. This is so much better. Keep it coming mom."
Be aware that many cats get really stinky, clear the house stinky poops on the Young Again foods. Also reports of digestive upsets and vomiting. Plus, it's only available by mail order and is really expensive. 4 pounds is $32.
https://www.youngagainpetfood.com/zero-mature-health.html
Epigen 90 is $25 for 5 pounds at Petsmart and Amazon.
How many pounds of dry food do your 9 cats go through in a week?