You can remove the meta items by adding the following css inside your child theme’s style.css file;
Also your posts are not showing full width due to blog side bar widget. You can insert some widget items which appear sidewise. Else if you completely want to make the post look full-width please add the following css;
Hopefully it works.
Note: This will effect only on staff pages , If you wish to keep same settings on other single post then you can remove .single-dslc_staff selector for all css.
Regarding staff thumbnails and intro text we shall keep that in mind in our further updates.Thanks for your suggestion.