Satiety for me had a lot to do with improved carb metabolism by having more B-vitamins available, but it also ties in with IR.
Feeling energetic after a carb-rich meal can also mean improved insulin sensitivity but for me, the 2 aren't combined: I can feel satiated, yet tired/sleepy because of the shift in tryptophan balance. Granted, it's not as present as before = carbs don't always equate carb coma anymore.
BTW, I wonder if the OP is still around and how/whether she adjusted her diet? Too bad if she missed yksin's most helpful post.