i do it this way:
Kill 3 ships with my corvette in a few seconds,
then deploy the drones from my class7 and class5 limpet controller (thats 7 total),
open the cargo hatch and position myself near the loot.
sometimes i think it is wrong that the limpets can keep up with my ship when i close the cargohatch and boost towards a 3km away loot cloud,
but as soon as i am at 1.5km or so, they detach and slow down to their collection speed.
and on their return route, they need that 200m vertical final aproach path to to my hatch
if there was a keybind that would allow me to cycle through non-ship contacts, i would not even use them in free collection mode.