Yup, it's a red line.
If the manufactirer would have thought it was ok, he would not have given you those limits (red lines) to stay away from.
So, while I appreciate your insecurity (and it should not be your call as the student), you've been in test pilot territory.
Not your call to decide what needs to happen, that is up to an engineer/mechanic.
Well done for asking the question and not hiding behind that instructor. You show character and moral courage wich will serve you well.