Hi Marky,
I'm really impressed by your bg numbers before a meal! They're bang on where they would be if you weren't diabetic, so you're obviously doing very well.
Post swimming, your numbers are dropping lower as a result of your insulin receptors being a bit more frisky after exercise. Either dropping your Novorapid dose before your meal, or eating a little more afterwards should smooth that out for you.
If you are snacking afterwards to keep your bg from dropping, I find things like nuts or cheese work well. They won't shoot your bg up too much and they will do a lot more to satisfy your appetite than chocolate or crisps ever would. If your mates have a nut allergy, so much the better! :lol:
Other suggestions might be olives, some roast chicken, celery sticks with a dip, that sort of thing?
All the best,
fergus