Would if not be possible to implement some sort of dare i say it 'cooldown' until you can use another Kami drone, some sort of drug effect that means you are unable to launch Kami drones for a certain length of time (tiered with the TL of the drone?) that way droners can still launch another drone or move away after detonation.

On another note i do think kami's should be unstable enough that if you bump into something it detonates