I've got my Maahes down from 7 units twice a day to 2-3 units twice a day (Prozinc) by feeding canned food supplemented with some dry kibble. He gets a variety of Fancy Feast Classic, or Grreat Choice pates (the generic from Petsmart and on sale for 35 cents a can!), twice a day at 4am and 4 pm, and can nibble on Wysong Epigen chicken dry kibble during the day/night. He gets tested and medicated at feeding time. His blood sugar is maintained between 100 (nadir) and 300 (pre-shot). The high pre-shot value is because he'll eat some kibble before the shot in the am so he'll spike up. It's either this, or allow him to eat plastic due to PICA. I know that his glucose control is good because his neuropathy is healing and he's not peeing as much. Overall, he's much more active, even for an extremely lazy animal.
He usually don't ask me to be fed and his appetite is great. His weight has regulated itself because of the diet change (from 25 lbs down to a more healthy 18ish, and up from 12lbs when he was first diagnosed with diabetes).
Now my civvy cats, on the other hand, think I'm starving them to death because of feeding times. They are spoiled rotten on the wet food and will not longer eat the dry food. Their signal that they are hungry is to tip over my trash can. And to think that they also thought I was killing them when I transitioned from dry to mostly wet! Pshaw!
Since I do have four cats, I put down approximately 10-12 ounces of wet food at a time. Sometimes they eat it all immediately, and sometimes they do not. I don't worry when there is wet food remaining because they will come back to eat when they want to eat. It's usually all gone by their next feeding time. I also mix the wet food with a little extra water and cut it up. My boys are dainty and don't like their noses touching the pates.
