When I use latex-preview-pane-mode and save after making an edit, the buffer with the rendered pdf is always zoomed to show the entire page when it is re-rendered. It is hard to see detail in this result on my laptop, so I'd like the pdf to be zoomed in a bit by default. Also, when I use ctrl- mousescroll to zoom in the preview-pane, there is always a large margin to the left of the pdf page that I'd like to get rid of.