Just by way of encouragement: your post was fine - for a second post or any other post. Keep thinking, keep contributing.
You seem to be looking for ways to make the cosmology logically consistent with itself and with western science. It would be good if it could be done, but I don't think it can. Sure, we can find points of agreement and points of similarity but there are enough differences to stop them coming together completely.
And neither side will (or can) let the differences be ignored.
Science always asks for proof of anything it is asked to accept - that's what makes it science.
Religion nearly always refuses to negotiate, saying, 'We believe this unquestioningly because it comes to us from our highest authority.' Buddhism is, by far, not the worst in this way but there are certainly Buddhists who show this attitude.
So what do we, as modern people in a world that runs on science, do?
The Dalai Lama, no less, has said that where Buddhist cosmology conflicts with science, Buddhist cosmology must give way. That's good enough for me.