I was concerned about a nitrogen surplus or deficiency as my research points to either one. (further clouding the issue). I'm in SoCal, so we don't have too much rain, but I've got them on a timer, delivering water three times per week via soaker hose for about 10 min per session. Shouldn't be too much? They receive full sun 8 hr per day. Can you point to something more concrete that I can do? They are setting decent size fruit, though there doesn't appear to be as much as in previous years. Can you elaborate on the rusty nail technique and where to get egg shell poweder. I was thinking it's possible if it's a nitrogen deficiency it may work it's way out in the next month...?