Hi Darrius,
About the testimonial shortcode, please let us know on which version of the testimonial you got the issue?
About the lazyload issue, in this issue, you need to contact with lazyload team to get assistance on the issue.
About the button issue, we are really sorry to say that we have no button shortcode. However, we have listed this in our theme update list. We will try to add some button shortcode in our next update of the theme. At this moment you could use wpbakery default button shortcode http://prntscr.com/mh7ynj
Best Regards,
ThemeLooks Support Team