Hoya sp. Perak Has Been a Lot of Trouble For Me

I’ve had this plant now for about three years now and it has grown very poorly.  I was all excited a month ago when a peduncle formed and started to bud up.  The excitement however was short-lived as the buds blasted.  Here is a photo of one of the leaves.  I have moved it outside for a couple of weeks to see if the cooler weather will help it bud up again.