Could you please start your own thread? So we can give you suggestions specific to your cat. This thread belongs to Rachel Dickinson.
Your signature says you feed him wd/md dry food, left out 24/7. If that has changed, please update the signature.
Dull coat, full of dandruff is a sign that your cat's diabetes is unregulated. My diabetic cat Wink had that, when he came from the shelter and was being fed the Hill's W/d dry food. Once I got him to eat the canned food, that coat grew shinier, the fur grew back and the dandruff went away. He had nickel and dime sized patches of dandruff. Huge! And the worst case of diabetic neuropathy imaginable.
Getting the blood glucose under better control, will greatly help the fur condition and the dandruff. If you brush him, that will also distribute the oils in his fur and loosen some of the dandruff and make Kitty feel better.
So, only 3 days on the canned food? So far? Did you just switch him from dry food?
Please be sure to get a pre-shot test every cycle. To keep your Kitty safe. You need to know that the pre-shot BG test is high enough to give your cat insulin. Then, you need to test in the middle of the cycle, to find the nadir.
You need to get at least 1 test in the PM cycle, after the pre-shot test. A before bed test every night would be good to get.
You also need to be a bit more consistent on your shot times. As close to 12 hours apart as you can. Some days the shot was at 10 and others it was at 11:48. Why almost a 2 hour time difference in the shot times?
I realize that you may not have test data for every single day, but please include a row on the spreadsheet (SS) for each day.