Don't sweat it. Seven months is still real young. Yes, at around that age young dogs will rebel. If you are really concerned about his training at that age, my suggestion is to back off abit. Sounds like you are putting way too much pressure for a pup.

Go pick up a good training program and study it. Your pup is nearing real training age. I know some trainers won't accept a pup under a year old.

You have 4-5 months to study, so use the time wisely. Read through your training program before you start. BTW, I believe personally, the e-collar can be a life saver for your dog. It should be used to reinforce commands the dog already knows and used very sparely in only those situations where the dog absolutely needs to listen. I haven't used the collar since last month and that was the beeper (no shock). My dog's collar conditioned so she knows unless she listens, something else is going to happen. I may beep her an average of once every hunting trip maybe one low shock a season, no more. Off season, transmitter stays home. I started conditioning my dog at nine months of age and that was early only because I put on a bark collar at around 7-8 months.