feed rate is heat generation relevant, you pump too much oil into a gasser it cools off the muff and the oil to the point it does not boil and vaporize, then you get one hell of a mess on the fuze because you're just blowing unburnt oil out the pipe and hardly any smoke at all because it's to cool to vaporize. on a turbine you can not cool the jet blast temp (EGT) regardless of how much oil you pump into it but you can pump enough it cools off the droplets of oil before it completely vaporizes on its way aft of the injection point so you can have residue left in the tail pipe. this is why you can add extra injector pipes around the circumference of the jet blast and get denser smoke. also if you squeeze the injector nozzle tip so it fans out the misty spray as wide as practical (depending on your installation) then you can pump more fluid per nozzle.

kc