[Christ]

Correct me if I'm wrong, but larger nozzle = less duration = less injection pressure = less atomization?

To a given extent, pressure is bad for atomization, but there a point where too little pressure is also bad, and adding larger injector nozzles may mean less pressure than the fuel system was designed for, causing less atomization of fuel.

This might not be a problem, since the turbulent air and heat have more to do with atomization than the injectors themselves do, but it's a consideration at least.