You NEED to tell him about that day. He isn’t going to be pissed because it obviously helped your physique and training, but if he doesn’t know how much gas to put in the tank he’s going to assume what he’s doing is enough, and you will have to keep sneaking refeeds to keep up.
TALK TO YOUR FUCKING COACH. You are paying him to guide you and he can only go off the feedback you give and how you look.
Getting my wife ready for Alaska a few months back and she was just not losing any weight for like 3 weeks suddenly - I knew every calorie in her diet, every cardio and training session length, every compound and dosage, lived with her and been present for every diet over 2 years. I was like wtf are you doing you should be practically melting fat knowing how she works...she was eating a second quest bar and sneaking almost a whole small pizza per week at work
Dropped the bs and she got so lean she didn’t even need to cut water.