So the thing about feeding later in the cycle, I wouldn't do it unless nadirs are later in the cycle. Think of insulin as you being in a car heading towards a stop sign. After nadir when the insulin effect is the strongest, the foot is off the gas and the car slows down (insulin effect slows down). If you add carbs after nadir, it's like tapping your foot on the brake, and stopping the car prematurely. Or shortening the insulin duration. Meaning you can end up with higher preshots. Not sure I've explained this as well as Jill did to me. But the basic idea is that it's best to do most of the carbs while the insulin effect is stronger. If you are feeding late in the cycle and seeing numbers zoom up towards preshot, that might be why.
I did give Neko a +9 snack, partly because she's chew my hand off if I didn't

, seriously though, +9 in the AM was when dinner was before FD so she really wanted food then. So I gave in and gave her a small mostly zero carb snack. It wasn't as big a deal for her numbers, because her nadir was often around +9, or even later when she was on Levemir.