Keep practicing Mike as it takes a little time to educate your finger as to how much to pull back on that trigger.
8-10 psi might be a little too low of pressure also. The picture I posted was shot at 20 psi. Paint atomizes better at higher pressures, but spraying fine lines with little overspray becomes increasingly difficult at the higher pressures.
I would try about 15 psi with about a 1:1 mixture of paint to thinner and see how that goes.
If the paint stops flowing then point the airbrush off into the air and blast a little bit of paint, clean the needle tip with your fingernails or a cotton swab and go back to painting those fine lines.
Mike
“Wisdom is the right use of knowledge. To know is not
to be wise. Many men know a great deal, and are all the greater fools
for it. There is no fool so great a fool as a knowing fool. But to know
how to use knowledge is to have wisdom. " Charles Spurgeon