Not bad. Those numbers aren't too wide of the mark. They certainly won't cause you much harm. Ideally, you ought to have a number in the 90's as a target to aim for in the long term. 84 isn't too low either. Certainly if you are a non-diabetic, you might expect your blood sugars, an hour or so after eating, to be somewhere between 77 and 83, give or take. Fantastic thing the pancreas, when it works!
I'm a firm believer that we should aim for numbers as near normal non-diabetic as possible. It's a difficult balacing act, when you're type 1 like me, between normal blood sugars and unacceptable risk of hypoglycemia. Glucose tablets are a great asset if you want to ensure your blood sugars don't drop too low. The beauty of them is that they will raise your glucose levels by a small, predictable amount. The advantage of this is that a low blood sugar won't force you into eating stuff that will send you levels too high.
Anyhoo, you're in the right place for advice on how to achieve success.
All the best,
Your numbers sound just about right to me. I was also worried when I started all this, and one time I had a reading in the high 70's and called the on call doctor. He said... "don't worry so much ... you're doing great!" I guess he was right.. my last A1c was 5.6... so just keep up the good work!