I think that may well be what i am experiencing and it is amplified by my not painting enough at the moment and not able to make up for the shortfalls with technical ability
More painting and an upgrade to a japanese unit down the line required I think.
One thing I find that simplifies it a lot is to mix up paint in a dropper bottle. That way you are not trying to dilute a drop or to at a time. Throw a agitator in there and you can mix it up and put it into the airbrush.
I have gone through a few A cups.
Olympos 100 A - no matter what I do I cannot get it to perform under 20psi.
Iwata HP 100 - Performed well but for some reason the trigger plunger froze.
Areograph - Was a great performer but I just don't use it since parts are unavailable.
Customized Badger 100 with SOTAR head - My favorite airbrush for the feel of how it works. Just such a extra tiny cup. So it is the one that sent me down the rabbit hole.
Olympos F-2 - A fantastic performer with the cowl barely higher than the trigger it works great. The body narrows at the front give a nice pen like feel and feels really similar to my Sotar.
Then there is the micro cup for Harder Steenbeck airbrushes. Basically it big enough to cover up the threads and put a lip around the edge to make the top into a bit more of a funnel.
Then there is always a cheap Thayer Chandler side feed. But I have been so distracted with playing around with and troubleshooting A cup airbrushes I have not gotten around to putting a Sotar head assembly and troubleshooting one yet.