Hi Kristijan,
Based on what i have seen on your pictures and from your observations, i would suspect following happening in your system: ( my personal obeservation on your case)
after cleaning and starting, you will have all 4 nozzles working, but the first one will get clogged up, then the second and so on, due to your high temperatures,
The last nozzle will not clog so easy because of the increasing velocity after the clogging from 1, 2 and 3…
( cutting torch effect, vissible in your earliar picture.)
since your engine creates a vacuum above the nozzles and your airinlet is bigger then the 4 nozzles, its more likely to have an even divided force on all your nozzles ( same vacuum on same hole size )
Any turbelance in your nozzle pipe would be minor due to the airspeed increasing on your 4 nozzles at start up.
In my opinion, even neglectible since you have a nearly constant flow and not pulsating from a single cylinder…
anyway, its a nice phenomen to study into…