Hoya sp. UT-033 did not do much for its first couple of years with no indication that it would ever produce a peduncle.  I finally pulled it out of its pot late in 2015 and discovered, as I frequently seem to, that the roots were rotten. I finally took cuttings and restarted it in hydroton using the semi-hydro method.  Below the flowers of Hoya sp. UT-033: