unminified HTML has only a slight impact on loading speed, I wouldn't worry about that. but what theme are you using, would like to test it to see what exactly causes the breakeage?
regarding kk star ratings; as with all plugins that rely on javascript you need to tweak autoptimize. in kk star rating's case you could exclude the javascript-file (js.min.js, which is pretty weird naming convention by the way) and/ or the inline javascript (using "bhittani_plugin_kksr_js" as identifying string). it is entirely posible kk star ratings depends on jquery and that you'd have to exclude that as well.
hope this helps,
frank