I'm a relatively inexperienced instructor with only just over 1k instruction hours... but one thing I am so careful about doing is doing and flying to much for a student. Firstly it's there cash, secondly it defeats the point of learning. LET the student screw up... let it snow ball and let them see what the end result will be i.e. while teaching climbing at 2000ft, student climbs at an excessively high nose attitude and gets into a stall! I guarantee if you let the student see the end result it will stick in their head!
As far as mentioning who has control... that is so so so important, ESPECIALLY in a cub where you cannot see eachother. It really sounds like you should perhaps think of changing instructors. You are obviously not enjoying the flying as much as before, and THAT is the most important thing. I've always said instructing is 40% flying and 60% a combo of psychology, teaching, patience, etc.
To me, there's nothing better than being able to patter a student (who has never flown before), to take off the aircraft all by him/herself!