This one had a learning curve, I'd heard they were thirsty but couldn't believe it needed that much water. After many lost peduncles, I've got one set of flowers opening and another close behind.
Just that some hoyas may need more water than you would think, really. I water this one every two days, it never gets dry. If it dries out at all the new leaves look weird and a couple of old ones will drop, as will the peduncles. It's in an airy soil mix, but I am constantly surprised that it isn't dying of root rot, lol.
Have you tried using an orchid fertilizer to get yours to bloom? The miracle grow spray seems to get them going, I use that once a week (it's very weak) and also use the shultz liquid fertilizer at about half strength every second watering or so, during the growing season.