It's OK to let Arya graze if that's what she's used to. For cats that are not grazers, it's worth looking at her spreadsheet data, and trying to see if you can find times that her numbers drop fast on the first part of the cycle. Onset (when insulin takes effect) is a common one. Fast drops can cause bounces, so you want to try to avoid that. Some tips in this post:
Using Food to Manipulate the Curve
A couple of other tips. When a cat first hits "green" or under 100, it can be a good idea to give them a tsp or two of food, to try to encourage them to surf or hang out in those healing numbers. The other tip is to try to limit the amount of food you give after nadir. After nadir, the insulin is starting to wear off, and any carbs given after that point will cause the insulin to wear off faster. This can cause a loss of duration (insulin not lasting as long), resulting in higher preshots, and then steeper drops the next cycle. Which can cause bounces....