Vets just have their own style of doing things from their training and their own experiences with diabetes. That's the way your vet is used to treating diabetes. The protocol and method we use here are not sliding scale, dose increasing race type strategies. Many vets seem to run on outdated knowledge of insulins as well, older type insulins can be dosed on preshots and have daily dose changes, Lantus and Lev are depot insulins and are dosed differently becuase of this. Some vets don’t seem all that familiar with depot insulins and instruct them to be used like the older types.
I think it’s good that he’s having a dialog with you and you’ve explained you’re reading up. At the end of the day, as well meaning as he is, or people on this board are, it’s your cat and you’re going to be the one dealing with the consequences of the decisions made, rather they are the vet’s or yours.
It sounds like he is concerned with keytones, and both of you should be. I’m far from well versed with DKA, but I do know cats can have keytones even when they are not in high numbers, so it’s best you stay vigilant to test for them since the history is already there. Is Luci still showing keytones and at what level? Also, because of the DKA history, some of the SLGS guidelines can be adapted in light of that situation, but it still wouldn’t involve whole unit increases every couple of days!