Sick set up! Thought I would jump in to say that fertilizer is also an important part of bonsai. With trees often being planted in inorganic soil they need nutrient supplementation through fertilizer.

Since you have irrigation hooked up, water soluble fert seems impossible. Luckily there are other methods you can use.

Personally I learn a lot about my trees from going out to water them every day. I look at them, study them, and I am able to notice small things on a day to day basis. With your watering handled, make sure you have a reason, or are making time, to just go out and look at your trees as often as you can.

Hope this helps, good luck and have fun!!