Hello Rama,
could it be, that UEF Engi Station-Drones count as high level Air units, that spawn extra ASFs?
if someone builds UEF Engi Station they get usually 50-100 ASF per Wave which doesnt makes sense. Only if they count like a T4 Unit and spawn 9 ASF per Engi Station. Or your Settings set a fixes %-Spawn of ASF if any Air units exists. Does it lower Gunships and Bomber then?