Hey, Wilbur -
I rarely get tip dry using my 200 with acrylics, if I do I find it useful to keep some cotton swabs and lacquer thinner handy. Just a lightly dampened swab and a swipe over the needle end gets it off straight away, also you can dial up the pressure to about 25-30 psi and press the trigger, that will often blast the blob of paint away.
Glad you got your NH back and in good order, for a simple tool they do quite well and reliably. Hope you keep it sorted.
Patrick