I have been trying very hard using every technique and trick that I can think of to flower hoya wightii sub. palniensis for over three years now with nothing to show for it except two dried up peduncles.  This year the plant has been directly outside where the bugs could chew on the leaves, and it got rained on every three days, or so.  We have had so much rain this year that I have only watered the plant twice since mid-May.  There are now two peduncles with developing buds on this giant plant.  Fingers crossed on this one.  Please think positive thoughts!