I'm not familiar with the 360; it may be the wrong tool for the job. I use a
Badger 150 and can get pencil lines at 12 psi, pretty thin paint and pretty close to subject. The single needle on yours has me wondering if this wasn't designed for larger applications like posters or t-shirt production. The 150 has three sets: xtra fine, fine, and hardly fine. I'd look around at
www.badgerairbrush.com and see whats available. You may want to sell the 360 on ebay and get a 100xl.
hth
The Keeper (of too much crap)