You can use your morning fullness (mirror metric) combined with how your workouts are going (gassing-out?) along with some logic about how quick you'll go through carbs (intensity and/or heavy-lifts uses-up glycogen). Know what I mean?
Yeah, I pretty much agree. Wouldn't necessarily drop carbs. Depending on how overreached you are. Imo, do full backloads until you feel completely recovered and ready to smash the gym again. Then drop carbs for the rest of the days, or go back in the gym.