2. "As if the structure of the universe at the time had been different in any way I would not only not have B&E, but probably not exist."
Imo you are necessarily running into problems if you try to grasp the concept determinism with such negative retrospective hypotheticals ("What if, hadn´t...?"). You are introducing a way of thinking that is not compastible with determinism. Things couldn´t have been different, at no point in time, and this includes the structure of the universe at that starting point you are thinking of.
I´m sometimes wondering why considerations of the "what if things were different" are so common and dear to us, why we even entertain such absurd ideas. I think the explanation is: Whatever we look at, we have a focus, a limited perspective. We understand how this necessarily leads to that,
but there is always the possibility that there are aspects we haven´t considered, and thus things aren´t turning out
as we would have expected. Somehow we manage to fall for the illusion that if "What if things don´t turn out as expected?" is a meaningful question then "What if things would be different than they are?" must be equally meaningful. It almost sounds the same, after all.
In real life and we can compare the different outcomes if changing only one factor and this allows for expectations. However, the universe is all there is, there is nothing to compare it to.
So it´s just the inability to imagine very long time spans?