Are you Type 1 or Type 2? It makes a difference in what you can expect and how you implement changes because of the time insulin takes to act and finish acting. As a Type 1, my own goal is to have both readings within the normal range. So if I go into the meal with a blood sugar at the lower end of the normal range, and after the meal it is at the higher end of the normal range, I am happy. That is a rise of more than 2, but it is still not doing any damage. If I go in with a reading of 4.0 and two hours later I'm 6.0, I'm almost definitely heading for a hypo, so I prefer a reading a bit higher (but still normal) after. I can't see why that wouldn't apply for T2s as well ( without the hypo, unless they're on meds that can cause hypos).