I just want to utilize my time and energy the most beneficial and efficient way to satisfy my dogs and myself. Get a schedule of what I need to do and what needs to be worked on and I am spending almost all my time and energy walking.
Hmmm if you want to do other type of activities, maybe you can take all three to an agility camp? Maybe once every two weeks or something just so they get to jump and do other things that will help strengthen. it's also good mental stimulation because you have to train them to run these courses.
If you want to organize your time better, I would create a schedule so you can make sure that each dog is getting some one-on-one time, and you can distribute your energy evenly.
For example, you can maybe make a habit of walking them always first thing in the morning, and a shorter walk when you come home from work. Then, after dinner, maybe you can spend 15 minutes with each dog individually teaching tricks/obedience commands, so that will take you an hour. Then the rest of the evening you can play with them, reinforce the training you taught them, grooming, socialization. On the weekends, maybe you can do more interesting things like take them to obstacle courses, ravines, parks, etc.
I'm really type A personality so I love having schedules and agendas, but I think balance is key, and just making sure your dogs are fufilled in every area: I'm very biased towards a holistic perspective on a dog's well being:
1. Good health and diet
2. Good exercise
3. Opportunity to rest/relax
4. Alone time with you one-on-one
5. Play
6. Socialization
7. Training/Obedience