help needed: which airbrush set for details?

[rcpower]

Hi,

I have a badger crescendo(175), but I cannot get it right for some fine/detailed work. Even laying down a simple shadow always results in just a to big spot...

I am using faskolor paint and set the compressor at around 40 psi.
Have already tried the included needles/nozzles, but the difference is not really noticable.

From what I have read/heard this set would not be suited for any fine work.
Is this correct?

What airbrush set does one suggest for some fine work?
I'll be mainly painting 1/10 ofroad shells.

thanks!