Re: Etiquette for changing dojo
If you have been at your current dojo a long time this might be a little more complicated. But considering your reasons for changing dojos I don't see this being a big deal. I would setup a time to talk with your sensei before or after class one day and explain the situation. If I was your teacher I would completely understand and would also just be happy that you were going to continue training. There is also no reason you couldn't stop by your old dojo to train every once in a while when your schedule allows.
Once you have had this conversation with your current sensei you should also ask him / her to write you a letter of introduction to the sensei of the new dojo. You don't have to do this, but it would defiantly be a positive with the sensei at the new dojo. It would also let the sensei at the new dojo know that you left your previous dojo on good terms and there is no baggage to worry about.