You are stressin too much about nothing. I have been teaching for 25 + years and any instructor worth his salt can fly with a student for a few minutes and figure out what to do with him. Bouncing from one to another is not the preferred way, but it won't add much time and will give you other perspectives. A good instructor will never try to change what another has taught unless the previous was just plain wrong. He will build on what has been taught.

Explain to him what you were working on with the last flights, and what you would like to accomplish with the next few flights. It sounds like you should be working with pattern work and getting ready for landing work from your description. Don't just go up and fly around. Work on specifics on every flight and you will solo very soon.

Don't worry about asking for help. They guys instructing usually enjoy helping, as do I. Its a lot of fun to watch your progress as a new pilot and it is satisfying to help guys learn. I am sure they feel the same way. Learn it well and then you can help others too. Never think you are being a burden even though some instructors don't show the enthusiasm all the time. Everyone gets burn out from time to time.

Keep with the instructors and you will be soloing before you know it.