Really what needs to be addressed is the AI attempting to colonize planets inside overwhelming SOIs in the first place.
This is a serious concern because in GC2 ToA, the AI still plants colonies in ridiculous places --- at least in my experience, playing at medium difficulties and immense galaxies. The Community Update to GC2 that is just about finished does not seem to fix this, although at higher difficulty levels the AI may do better. Perhaps others can comment on that.
I have to admit that this practice is at least annoying, for a while.