Is it too late to bring your attention to the nuance of a Chihuahua being killed non-stop?
It seems that friendly ships ignore decoys, what in turn leads to real_ship jumping into friendly fire to get away from enemy even weakest shot, and with it's fragility, to be obliterated.
Maybe it's possible to make it so that ship not so instantly switches place with decoy, kinda fade after being shot and kinda re-emerges in a decoy spot, and fading state keeps it being transparent to shots (and not being able to do it's own ofc) but real_ship projects it's "i'm real, don't shoot me" info-state as soon as it switches to decoy?
Theoretically, I do realise complexity for such a change but I can't think of anything else, thing you've made are nice and problemless as is.