Let's start with washing - it's a good idea to wash and rinse to remove med remnants, oil from fingers handling etc. Some here rinse with boiled water, others with (.2 micron) filtered water. I wash the Aerobika the same way. I am odd man out here - I don't boil every time- it takes biofilm time to form, so I wash every time and boil once or twice a week.
The neb cups that warp with boiling are disposable ones, meant to be used once or twice and discarded.
You can buy reusable ones on many sites like "just nebulizers" or "nebology" - they can be washed, sterilized and reused for 3-6 months. They usually come with new tubing, and most are interchangeable to most nebulizers.
When I first started this journey in 2018, I ordered one each of several types to find the one I liked. After several including the Aeroeclipse, I settled on a generic one and buy them 5 at a time.
I also melted a few early on, and learned to use a round silicon trivet or hot pad in the bottom of the saucepan, and keep the burner just high enough for a gentle boil. No need to use sterile water there, the boiling takes care of any germs. Others use microwave or counter top baby bottle sterilizer instead.

There is a benefit to nebbing first and then using the Aerobika and doing airway clearance IF you have a hard time clearing mucus - the time lapse allows better penetration. But if you feel "all cleaned out" after a session you're probably doing okay. You can double check with your pulmonologist.

Are you also being treated for MAC?