The main difference between a high-end airbrush & a cheap one is the quality of the machining of its components Monica.
Although generally ok, some Chinese clones suffer with their nozzle cap being very slightly out of true. So instead of the nozzle tip & cap being perfect concentric circles, they're like this
If there's an o-ring at the junction of the nozzle cap & airbrush body, that can affect it too. As the cap tightens & the o-ring compresses, it can alter the position of the air hole in relation to the nozzle tip.
I chuck away supplied o-rings & wrap PTFE tape around the threads to ensure an airtight seal.
The part I'm referring to is the one marked 'air cap' in the picture below (I always call it the nozzle cap)
View attachment 256016
The really important thing is not to adjust the cap too much. If its unscrewed too far, the nozzle tip will end up too far back & the paint won't flow properly. The tip of the nozzle should always be slightly proud of the cap like this
Of course, everyone's airbrush is a wee bit different because of use & cleaning regimes etc. So my advice is to break down your one & reassemble it without the needle. Then have a good look at the business end using a magnifying glass.
See if there's any misalignment & adjust the air cap a little until it looks ok. Mark the position of the air cap & put the needle in.
Then try it out to see if it works better. I did that with my one & it made a big difference. Not only was the spray pattern straight (it was slightly off before), but there was no spitting or splattering.