I have seen Google+ post is gaining more worth in SERPs. I have published the article and shared on Google+ than the very next day i check the SERP the Google+ post is showing on the top of the Google ranking.
Let us know if the post STILL shows up after logging out, clear cookies and cache, closing browser and try again. Even better use a different browser and see what that produces.
g+ is, after all, a g property and those have been getting solid placements in the serps.