I don’t know if this helps anyone, but I simply removed the wpautop function from the plugin and this gave me the formating that I needed.
I simply want a bunch of dense, short single line asides and this removes the <p> added by the wpautop function and I added a <br> after the sidebar formating via the plugin option page.
Change line 142 from
$replacements[] = wpautop($sideblog_content->post_content);
to
$replacements[] = $sideblog_content->post_content;
This may well break other things, but works for me.