@mchang1
A cup of melon is not horrible by itself but it's going to have 10-20 carbs, depending on the melon type.

Try adding a few carbs to dinner, it might help rather than hurt. I get my highest reading in the morning after I've been "fasting" for 12 hours. And the other day I tried skipping lunch and sure enough my pre-dinner reading was 25 points higher than usual, the body notices the lack of carbs and releases more glycogen.

Look into "resistant starch", the classic is pasta or rice made normally then instead of being eaten immediately put in the fridge overnight. The next day, preferably eaten cold, the carbs not only affect blood glucose much less than normally but they also seem to buffer any other carbs you eat at the same meal! Some baked products seem to do the same, the organic whole wheat bread from Trader Joe's seems to do this for me too, and even some packaged cookies may have been cool so long they do the same and can be eaten with much less impact than you'd think from the carb numbers.