Yea, would be interesting to get a full picture of the plant in it's environment, size of the pot's ect....
When you say 20% runoff, are you ensuring the root base is getting completely saturated? It's easy to water dry coco and get runoff, but it's not always saturated inside, so great care has to be taken to make sure all of the dry spots are in fact being saturated.
Also, I think pot size is a big factor in all of this. Often times, the plant is placed into a pot far bigger than what is needed for the developmental level in question.
But yea, I had to look for it, but I see the webbing now (good eye aquaman) and a little stippling also. I think I even see what looks like mites on the stems themselves.