It's nothing weird here. The temp drops because the meat is almost done. Btw, how do you usually cook the meat? Do you have a secret recipe?
In the last time, I count everything on a food scale digital. Because it's easier, I don't waste food, and my family eats everything from the plates. That's what I do when I cook meat too. I have to put on the scale weight the stake, not more than 200 g per person. But salad, salad as much as possible. We eat as few carbohydrates as possible, but it's usually a balance when preparing the meals.