My Endo suggested that try to exercise away some of your daily carbs rather than blousing. For instance back off on 25% of your lunch bolus and workout a few hours later when your BG peaks until it is back in range.
I started to gain a bunch of weight after getting my A1c down in range and it was hard for me to learn to workout without going low - I’m still not good at it. The pump is not likely to help with weight loss unfortunately but it will help you gain tighter control and then you can also do things like back off from your basal rate to allow your BG to go up and again work out until it’s back in range (By up, I mean like 150) both of these essentially reduce your insulin consumption without decreasing your food intake if you feel like your diet is good the way it is. They also prevent you from having to eat to many extra carbs in order workout without going low.