Well, first of all, use a bigger pipette, or stop pulling so much paint out at one time... They come in all sizes and you can order them on-line in a thousand different places on any given day... A box of 100 runs, on average, about 12.00... Or do what I do... Make a friend that works in the lab at the local hospital, and rip her off when you go see her for lunch every now and then..
I also mix the paint in the airbrush bottles, so I can just pour straight from the bottle. Make sure you strain the paint though. I make field expedient strainers from my wife's old nylons... Just cut a square of it and lay it loosely on top of the ottle and secure it with a rubberband.. Also, buy some more paint bottles for the AB. I buy a couple every few weeks at Hobby Lobby, so I can just keep the paint mixes in the bottle after I finish a job...