Great - they look very happy! I'm impressed you don't have a problem with leaf spotting. It doesn't harm my plants, but newly planted rhodies seem to get it for a couple years until they somehow "grow out of it", which of course doesn't make sense with plant physiology, but that's what seems to happen.
I'm talking about the reddish, uniform spots. Most affected by it right now is my 'Choremia'. I could post a pic. But again, many other plants have had the problem for their first couple years and it went away.