Jimster
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To me, they look like they are about done. When I start to see that, it is typically when the plant is spent and is going too long. Surprisingly, corn will do the same thing if left too long in the field. I often find a small nub at the end of a huge cola when trying to let it get huge-er. Too much heat can also cause it, so look for hot spots if it's just in one area.
I apologize for my misunderstanding of the term "Foxtailing". I was referring to the way that the larger colas tend to get little nipples on the tip, like corn gets late in the season. The general looseness of the buds wasn't what I was describing, just the little nub I see when I go a little too long on some plants. Sorry for the confusion and possible misinformation.