I have added a new page for Hoya sp. IML 557 that details my experiences with the plant. It can be accessed under the drop-down menu: Hoyas (N-Z) at the top of the page.  I have also uploaded a new video tour of the plant to You Tube.  It can be accessed from this link: youtu.be/54NHKx70B4o

Here is one more photo of the bloom: