I am surprised your CF specialist is not having you come in every three months. Is he/she associated with an accredited CF center?
However, I will add I have always had "mild CF" and have always been seen at an accredited CF center. Even they treated me similarly to the way you have been treated - that I was "too healthy" too need more than an inhaler and some antibiotics when I got sick. Then I joined some of these online CF forums and learned so much about CF, and how it is progressive, even if you are considered "mild." Eventually, CF will catch up with you, cause your lungs to decline, you will be in and out of the hospital more and more, etc (I mean the collective "you" not "you" personally kittenface). It just make take longer for those of us with "mild" CF. So I started asking my doctors about things like the vest and hypertonic saline. And, once I started hypertonic saline, I got bronchitis less often. After I had my daughter, I realized how much I want to stay healthy for her for a long time (I want to meet my grandchildren) and I got more aggressive with my treatment and asked my doctor why I wasn't on pulmozyme. And I started allergy shots. Both those things are helping even more.
Anyway, I just wanted to share this, because it's so important to learn everything you can about CF so you can be your own advocate. It will have a significant impact on your health. And I feel like this is especially important for us "mild" CFers because it seems like some doctors act like they don't have to worry about us. Adding nebs into your routine will be a pain in the butt, I'm not gonna lie. Especially with everything you have going on, but there are ways to make it easier (when I used to work, I had an adaptor so I could do them in the car on the way to work). And, I try to remember it's either spend time doing nebs now, or spend time in the hospital (or on disability, or feel like crap all the time, etc) later.