Changing instructors so much in your first 8 hours will definately hinder your progress. I would recommend either trying to stick with an instructor you think you will learn well from, or a change of schools.
8 hours should be ample time to cover the first 9 exercises correctly, but different instructors have very different methods. How long did you spend on 4-6? should be at least 2-3 hours, but is often rushed and crammed into 1-1.5. These early exercises are the very foundation of your flying ability, and instinct such as the need to use right rudder when entering a climb. If these are not emphasised early on, students often struggle with 7-9.
The best advice would be to talk to the CFI and voice your concerns. If noone is availble to help you, change schools asap.
Good luck with the rest of the course, I hope you haven't been put off too much.