I only assist feed hatchlings that had never taken a rodent. snakes that go off feed will eat when they are ready provided that they are healthy and your temps, humidity and ect... are correct.
I agree. I wouldn't assist feed a snake that has proven it can eat on its own.
A ~100g drop for a snake that size really isn't that much. Thats only ~12% of the snakes body weight, which is about 1-2 weeks worth of food.