Love reading about the zoomies!

. It's a sign that he's feeling better, as is him grooming more. We have a acronym called the 5 P's (preening, purring, playing, peeing, pooing). We like hearing the 5 P report, cause it tells us more than what we can see from the BG numbers.
I second Helen's suggestion on recording food. I'd put it in the Remarks column of the spreadsheet so you know when you gave it, quantity and carbs. With the spreadsheet, you should be able to see how long higher carb food lasts. You can assume higher carbs takes 20-30 minutes to take effect from when the food is eaten to impacting blood sugars.
Another suggestion is when you first need higher carb food, start with high end of higher carb and a tsp or two only. Cats really vary in how carb sensitive they are so you will be experimenting and learning what your cat needs. Jill's Alex, (of Jill and Alex who wrote the Sticky's above) got a food bump just from freeze dried chicken. I've seen others who need 25% carb food to move. You do want to start with the higher carbs for safety, then learn if you can lower the carbs. The first times I gave Neko anything over 20%, she soared 80+ points.

I discovered that for her, a 16-17% carbs was ideal. Unless she was under 40, in which case she got a drop of syrup (karo in the US).
Which specific MC or HC foods you give can depend on a couple things. First is the % of carbs you want to give. Second is the contents of the food. Many people may suggest the FF gravy lovers etc. but I tried it and found Neko was allergic to wheat so that was a no go. FF uses wheat for thickening and is what is the carbs component. I see you are using NV as his main food. Some of their LID foods are MC, and the flakes have MC and HC options. The LID has peas for carbs. If you are trying to stick to just a chicken diet, maybe you could look at something like Weruva. Their Cats in the Kitchen pouches are what I landed on for Neko cause their carbs were from potatoes and have some good MC and low HC options. Of course, Charlie has to like more than pate for those foods to work. Weruva's Grandma's Chicken Soup is over 20%.