Maybe have different types of droplet noises if you are under a leaf block while raining to reflect occasionally getting larger drops fall on you through the canopy?
There is logic for a drop of water that falls and hits the ground. I had to purposely put in logic to ignore water drops coming from leaf blocks. The reason is that it sounded liked someone playing the maracas or castanets in your ear while standing in a bunch of trees during a rain storm. I do plan on revisiting this at some point - I have an idea to try out. (The leaf blocks do "sweat" when raining.)