For SOME cats, feeding after the insulin peaks (the nadir when referring to BG numbers) raises their numbers. You don't want to feed within two hours before the shot as the food will raise the BG and change the preshot numbers to where you can't see where the cat would really be. My cat has a funny curve, so I feed at shot time, at +1 and +2. He still gets treats throughout the cycle whenever I do a test. Others feed at +3 and +6. Most don't feed much after nadir, but some do. And some free feed and pick the food up a couple hours before shots. Until you you know your own cat's patterns, it will be hard to tell what's causing the higher numbers. For some cats 7% carbs is still too much. Many on here aim for 5% or less. I try not to go over 4-5% unless I need to slow a BG drop.
You also have to consider the source of the carbs. EVO is grain free, but it has fruit and vegetable ingredients. Cats are obligate carnivores, and ingredients from plant sources are unnecessary in the diet. Some cats are very sensitive to those things even if the % of carbs is low. If you're concerned about leaving food out, you can get a feeder with a timer that will open a compartment every couple of hours, or you can put canned food in ice cube trays and put a cube or two in the bowl overnight or while you're at work, so they stay fresh and the cats can eat them as they melt.
Remember that every cat is different. Without knowing how your cat reacts daily to insulin and food, it's impossible to know what's causing the higher numbers. Are you still only testing BG at the vet's? If so, that itself could be the cause. Stress can raise BG...my cat is good for a reading of 50 or more higher at the vet's than at home.
