I know exactly how you are feeling, I was that way too! My carb numbers are almost the same as yours... breakfast is 30, am snack is 15, lunch is 60, pm snack is 15, dinner is 60, and bedtime snack is 30. Originally I was told to test 1 hour after eating and be under 130 and also under 90 for fasting.
I could never get under 90 for fasting, but for almost every other test I was under 130. I talked with one of the OBs at my practice (who actually had GD herself) and she told me to continue on the diet for a week, monitor my carbs and my sugars. After I week I called her back, shared some of my numbers, and then she suggested I go on insulin. I was glad she gave me some time to get used to the diet and try to make it work on my own.
I am on insulin now, but only twice a day. It has helped keep my fasting numbers down. Also, my endocrinologist told me to test 2 hours after eating, where I'd be under 120. I've been almost perfect with that, just a few meals were a little above.
I'd suggest making sure you are watching your sugar intake. Also make sure when you eat carbs you also have a protein of some sort to go with it. For example, a bedtime snack I sometimes have is cheese and crackers with a glass of milk. (my sister's suggestion who is a type 1 diabetic)