There is no mystery about what you are experiencing. Once those carbs get in the picture and start the insulin train down the tracks, hunger hormones and all sorts of chaos ensues. The only way to shut it down is to deprive it of fuel.

My suggestion (and you may think it's crazy) is to add a fat meal to your day. Commit to your 3 Cambridge servings, but add a meal of primarily fat and moderate protein. This should be as simple as an avocado with some olives, or a couple of eggs cooked in butter, or some salmon with some olive oil. Fat will help you get back in to ketosis which will once again get your appetite under control AND help with your head hunger by giving you something to wait for. Fat is satiating and self limiting as is the small amount of protein. Absolutely no grain or sugar or veg other then leafy green if you must. I know this may sound goofy, but basically you want to encourage and support your body to get back in to fat burning mode and not sugars, which is making you hungry. The amount of carbs in your Cambridge will get you there if SSing, but a few days of fat supplementation while carbohydrate deprivation might smooth the way back to SS. Make your meal and then leave the kitchen for the night!

If that is too radical to consider, then up your Cambridge servings to 4 or 5 until you get back in the groove.