Very solid theories. It's always interesting to see how OOC things may be explained ICly. Have you ever thought about that Bluespace could also just be a gate to another Universe? You bring up real life theories, so maybe Bluespace is a gate into just an alternate Universe, as the Multiverse Theory suggests. The Veil, as you called it could be thinner in some places. Maybe the Romanovich Cloud, through any anomalous property it might have the Veil is thinner, meaning that Bluespace has more of an effect to the real world. Some examples, you also brought up could be the randomized asteroid (no one finds it strange that the asteroid is randomized every shift, it's like no one notices or can notice it), crashed ships, which have been crashlanded or shot down because in another universe during the latest solarian invasion it was shot down there (as an example).
Structures could be the same, solarian listening posts because the latest interstellar conflict has led to a cold war situation, maybe they were constructed because some advanced cloaking technology exists in another universe - the possibilities are endless.
Fun read, I'd love some more anomalous things in lore. Both for IC and OOC knowledge.