Aztek and Model Master Acryls question????

Hi, I have an aztek airbrush and I typically shoot Tamiya acrylics and have NO problems..

Now, I am building a Fw-190D9 and am using Model Master acrylics.
The problem is that the Model master acrylics clog the tips REALLY bad and the paint flow isn't very good. I have tried thinning with 90% alchohol and also with the Model Master thinner and get the same results.. I am shooting at 20-30 psi..

Tonight, I tried Aeromaster acrylics with distilled water and got the same results.. It's almost like the Aeromaster is the same stuff as the Model Master.

I typically build armor and Never have a problem with my paints, but whenever I build luftwaffe aircraft and use these paints I have all kinds of problems.

I understand that Model Master has now come out with a "NEW" formula.. Should I try that??? Or does anyone have any suggestions on what I am doing wrong????