Are you saying that even with the good numbers on the DM he is still not regulated with the insulin?
We can't tell, because you don't have a spreadsheet set up for Smoke and linked into your signature. We can't see how good his BG levels are or how well regulated he is.
Should i maybe weigh him at certain times each time?
Sure, consistency is a good thing.
I weigh my 3 kitties twice a week and try to do the weigh-ins the same time each day. That time is in the morning before breakfast. The reason I'm weighing everyone twice a week is because when I first was fostering little Dancer from the shelter, they were concerned with her health and weight and requested twice weekly weight checks. I've simply kept up that routine and weigh all the kitties so none of them feel left out. ;-) They all get a little freeze dried treat for being so cooperative and that helps.
A couple of times during weigh in sessions, one kitty has used the litter box after their weight check so I've taken the opportunity to get a post void check. It's usually anywhere between 2-4 ounces. I end up sort of averaging the weights for the week and adjust food intake up or down as needed. For instance, Wink right now is down about 3 ounces from normal, so he's getting a bit more food and some extra freeze dried chicken treats.
Once a week weight checks should be fine for most kitties.
It does take time for a kitty to gain back some weight. Wink dropped about 12.3 pounds to 10.2 pounds in about 8 weeks and went OTJ where he's been for the last 15 months. I thought that rapid weight loss was much, much too fast but neither the shelter or the vets were concerned with his rapid weight loss. Even now a year later, he's only up to about 10.9 pounds. He'll gain a few ounces and lose it, gain 4-5 ounces and lose 2, gain a bit and lose a bit over and over again. I'm happy if I can keep his weight stable and will give him extra food if I think he's losing too much. It's hard though, because he'll only eat so much food at one time before he's full and walks away. Those freeze dried chicken treats crumbled on top of his food sure do help to tempt him to eat the last little bits. I also found that taking him into a separate room to finish the last little bits of food and locking out my piglet kitty Monet helps a great deal. Wink no longer is any good a pushing a big bully like Monet out of the way.
My feeling is that even though Wink is OTJ and is getting good BG readings, he is missing a little bit of nutrition from the food and needs a bit of extra food to maintain his weight. I've been adding some extra pure protein like a tablespoon of cooked chicken or pork to his meals a couple of times a week but will increase that to every day for a while to see how he does. I'm concerned with the loss of muscle mass in his hind quarters and think the extra protein intake may help him gain back some of that lost muscle mass. He's somewhere in the 11-13 year age range where that muscle mass loss is pretty common in cats.
I hope that some of the ideas I'm using for Wink will help you out too.