Having the reader remember and go back to the zoom level used for annotations was a workaround that appeared in one of the updates. I realize it isn't enough, but it helped me out.

I find the best zoom level to display all the text and still allow me to make annotations and go from there.

In a couple of other cases I actually reformatted the page size and margins in the pdf to allow me to find an optimum 'annotating' situation. I have access to acrobat pro and publishing software. I also have the time if the book is important enough to me.

So, while a workaround, at best, it was still an improvement.