Hi flagardener! That is a very nice collection! I also grow just a couple of Hoyas, only one of which I've seen blooming...The Hoya carnosa 'Hindu rope'
The other that I have is the H. kentiana. It had formed a peduncle a couple months ago, but sadly, it either blasted, and fell off, or was eaten by one of our ferocious anoles!
Haven't determined which yet!
Love the Hoyas!