Pippi, thank you for the reminder about dormancy. Many of my plants are putting out new growth right now for some reason and my hoya was, too, for awhile, but the young leaves have stopped growing and I guess I didn't think much of it in the last week or two.
I think I will also do a soil test soon, too, to make sure. If it isn't acid enough, do you think adding some coffee grounds to the top would be okay for a hoya? Or are they too sensitive for that method of acidification of the soil?