((I previewed this and it’s really long, and meant for anyone reading this, not necessarily just the OP, it’s just once I start spewing information I can’t help but try to make it complete.))
I don’t know how I missed the original thread, but I’m glad to hear your kitty is doing OK. I’m a bit of a feline diabetes specialist - I have had a diabetic of my own who I got in to remission with tightly controlled insulin treatment - and I work with and train people who adopt diabetic cats from the shelter (as few and far between as they are).
Has your veterinarian mentioned testing blood glucose at home? You can do it easily via an ear prick and using an AlphaTRAK meter. You can track blood glucose daily that way, or at least do the curves yourself and call in the results to your vet, who can change doses and save you and kitty a day at the vet’s. It’s a very personal choice, though, and some choose not to do it, but you’re much more likely to get kitty into remission the tighter you can control insulin doses. Which insulin is your kitty on? I mostly see cats on Glargine these days, and that’s what I used at home.
I worry a little about descriptions of cats being wobbly or weak because that can sometimes indicate blood glucose being dangerously low. Seizures can happen if kitty’s getting too much insulin and glucose drops below 20.
As far as food goes, while many veterinarians might prescribe a “diabetes diet” for their clients, a bit of research goes a long way. Many regular canned cat foods are even lower in carbohydrates than the prescriptions ones. Lucky for us, someone has already done some of that research, and provided a handy list available here - this is the US list, which I would think overlaps a lot with Canada, but there is a “non-US” link at the top of the page for Canada-specific stuff.
I mention the food because it really is vitally important for diabetic cats to get switched to canned food if they weren’t already getting canned, and also to review the canned food they’re getting to see if it still might be higher in carbohydrates than it should be. My rule of thumb for people, especially if they’re finding food that’s not on the list or if they’re in a pinch and need to get something different than they usually do, is to avoid “formed” food. Pretty much any canned food is going to be better than dry kibble, but many canned stuff with the formed bits, called “slices” or “shreds” or “flaked” are not really sliced or shredded or flaked, but rather formed with wheat gluten - “with gravy” is also a tipoff. Stick with the “pate” style, or with fishy stuff in consomme or aspic.
The only kibble I recommend to people is Innova EVO. I don’t recommend it as a regular meal food, though, because it is extremely dense in calories and is very easy to overfeed your diabetic cat who probably should keep the weight that was lost off. EVO is about 600 calories a cup, compared to average cat kibble that’s around 400 calories a cup. Considering most cats should get around 300 calories a day, that’s a big difference. It’s great as a treat, or as 1/4 cup as a meal with the second meal being canned. Other treats that are OK are the all-meat treats like freeze-dried fish/meat or I even recommend those little frozen “salad shrimp” that can be taken frozen from the package in the freezer and rinsed under water to thaw almost instantly (as long as no salt is added).
For all I know, you’re already feeding something fine, I’m posting this for others who may read this thread, too, and could use some information on feline diets.
On preview, frequent urination, and large amounts of urine, are indeed a symptom of diabetes - of unregulated (high) blood glucose. If your kitty is still urinating a lot and frequently, also consequently drinking a lot, that’s a good indication the insulin dose needs to be raised. (Of course, don’t do this on your own, veterinarian must determine doses - I know you know that already!) A cat who has well-regulated blood glucose will urinate normally and that frequent/large urination should go away. Oh, one other thing, if you do want to check for high glucose without pricking an ear for blood, there is a product called Glucotest by Purina that is tiny squares you add to the litter box that give a reading like a test strip. Both this and the AlphaTRAK can be ordered by your veterinarian for you, or I’m sure you can find them online.
But making sure kitty is getting the right food can also help him need less insulin and keep glucose from spiking in the first place. ALL cats can benefit greatly from a low-carbohydrate diet. After all, they are obligate carnivores and naturally should be eating food that more closely resembles stuff from a can than kibble. I know, you know that already!
I hope you and kitty keep doing just fine. The things we do for our cats. Ask the lady who had three of her cats need surgery this year - Ack! 
