You're really not supposed to have more than four meals a day. You say you don't have a problem until later. Why not try saving a CS for after your RM later at night.

I'm sorry you're allergic to sweeteners. Have you tried Stevia? Maybe that with a little fructose would work for you for RM treats. If you PM me your email, I'll send you the CAD cheat sheet. Your problem might be as simple as eating some of the wrong foods at your CMs. Usually even hypoglycemics even out their blood sugars after a couple of weeks. Give it a try for a week or two, if you can. If things don't improve while sticking to plan this might not be the WOE your body needs.