Glad to see you increased. No tests last night?
A couple of things come to mind. When you get a low number like this you need to HOLD, no food, and re-test again in 20 minutes. Yes, I know that's a tough one because kitty wants his breakfast! But what you're trying to determine is if this is a number on the upswing (meaning has he already been lower or higher) OR is it on the downswing.
Now that food has been introduced the next number will most likely be higher because it's food induced. So it's going to be difficult to say. A 79 is a safe number to shoot IF you're going to be there to monitor and IF you have your hypo kit ready (medium and high carb food, karo syrup) in case he really starts to drop low.
So the first question is why no tests last night - especially after an increase - those night time numbers are critical.