I wish I could tell you that I know you feel, but I don't.
What's your fruit intake like? How about avocados? Nuts? Honey?
I'm trying to come up with calorically dense foods for you without getting too far from a PB framework. A great way to get those calories would be a nice fruit salad with coconut milk, nuts and honey. An occasional indulgence for me (without the honey), but it could be a couple of times a day thing for you.