Nick Bilton wrote an article on NYT Bits how Facebook engagement dropped, and works only when you pay. It's a shame. I also have same kind of result. And I also did test. Without paying it's not possible even to reach to your 1% user, who are already subscribed, or liked your page. It's not unintentional algorithm issue, its Facebook's business approach. So Facebook sharing is not as free as it were year ago.
I actually pushed some rapid updates to my “Social Profilr Reimagined Changelog” plugin. Current latest version is 2.1.2, its more light weight and come with fixed dropdown view, with some minor changes. You could download it free from WordPress Extended. If you face any issue report bug in Plugin support page or in this blog.