I could find little use for my 0.15 nozzle because of the majority of paint I use. I generally have to pull the needle back quite a lot (make the trigger very unresponsive) to get the paint flowing and by then too much paint would come out. Or I will have to thin the paint so much that it is practically useless on plastic. Or I would need to crank the PSI to 30+ and risk blowing my tiny parts away. I theorize that it is because that long slim 0.15 needle is designed for inks and high quality paint that flows very well. So, I took my 0.2mm needle and paired it with a 0.15mm nozzle and the results were quite positive! Now I have a shorter, sturdier needle that will create more opening when I pull the trigger. With the left over paint I was using previously, I immediately notice a huge improvement in trigger sensitivity, the moment I touch the trigger, paint starts to flow and flows very well in a very controllable fashion. Atomization is better (very noticeable when spraying on plastic) and only 12 PSI is required. Dry tip is gone for the entire time I was testing it. For model paints, I think the 0.2mm needle is a better match for the 0.15mm nozzle. I notice no disadvantage or drawbacks thus far, anyone tried this combination before?