If a student Is making small jerky corrections to their attitude there's a fair chance the eyes are inside. The aircraft folder always served a good purpose to - 1 hit the student
and - 2 block the instruments.
Students who are pushed towards p+a=p from the start end up with a much better fundamental ability to fly. Those who constantly reference the instruments struggle throughout. The performance check should be a 2-3 second scan at most once they have a handle in where to look.
You would be suprised how well you can tell if you are high or low in the circuit without an altimeter. Give it a try.