I'm so sorry this has been such a struggle. You do want to keep increasing - I know it's hard, but some cats need quite large doses for a while, and especially when you're dosing around budesonide. While for some cats it raises BG less than other steroids, it looks like Ramon is in the group of cats that are impacted by it, so your dosing isn't going to be "normal". I know I would struggle too if it felt like the insulin wasn't doing anything. It's going to be a matter of adjusting your expectations for what Ramon's spreadsheet might look like. As long as he needs to be on the steroid, you're going to see that impact in his numbers and his dose.
I want to assume your vet walked you through all of your options before starting the steroid, but given the variations in vet quality we run into around here, it may be worth double checking....
If I remember correctly, Ramon already takes a probiotic daily, correct? Have you already tried removing any foods with carrageenan (this causes IBD and skin allergies in many cats)? Have you tried a diet completely free of fish (checking the ingredient list very carefully since it often hides)? Have you tried a novel protein diet for at least a month (rabbit, kangaroo, or venison are usually the easiest to find - making sure there are no added chicken, turkey, or fish sneaking into the ingredient lists)? Have you tried a raw food diet?
If you've already walked through all of those for several weeks (typically 4-6 week trials) and he's still showing the IBD symptoms, then the steroid is likely simply necessary and you'll just need to dose around it. If your vet didn't tell you about one of those steps, or you're not sure you tried it long enough and want to give it another go, for many cats their IBD can be managed without an ongoing steroid through consistent probiotic use and careful diet choices. And if that's an option, it will likely help with the BG numbers. Again though, if the steroid is needed, then it's needed. And knowing that may help your heart as you can adjust your expectations of his numbers and find some peace in knowing his numbers are just going to look different.
Please ask if you have any questions about any of that, and again, if you've already tried them, no need to type out the whole history of the trials and fails along the way. I just wanted to make sure you knew about them in case your vet hadn't been thorough. My assumption is that he/she was though, so we'll just keep dosing about the budesonide and get to the best numbers we can for Ramon.

