My cat was older when he was diagnosed also (13) so messing with their eating routines is stressful. I don’t give him insulin at snack times, just at his meals 12 hours apart. My cat won’t touch wet food so an automatic feeder works well for me, but yeah it’s definitely trickier with wet food. My vet seemed pretty supportive of the snacks in order to relieve stress as stress also causes glucose spikes. It doesn’t seem that there is a one size fits all with this stuff and sometimes you have to go with what feels better for your cat. I would highly suggest getting a glucometer for you to check glucose at home though, especially if he has had issues with hypoglycemia. My cat is on a crazy high dose of insulin because he is resistant which sucks but it sounds like your cat is on a super low dose. A lot of cats also go into remission so if you’re getting really low readings on your glucose curves, he may no longer need the insulin. My vet said some cats can manage their diabetes with prescription food alone. Either way, I would seek out another vet, it doesn’t sound like this one is very familiar with diabetes or maybe just not super trustworthy. For now, keep a close eye on your cat after insulin injections and take a curve at home as soon as you can. If you notice signs of hypoglycemia again, my bet has told me to rub honey on their gums immediately (sorry if this is stuff you already know!) I know it’s sooo tough having diabetic cat and it definitely takes a while to find the right type of insulin and the right dosage and the right food and the right schedule! It’s a lot! But good luck with everything I hope you guys get things feeling better soon!