Sorry I didn't update sooner. Must not have been subscribed to the thread.
So the lip locking went on for a few more days and then stopped all together and hasn't returned.
Right now I still have 6 julis. There appear to be 3 pairs, one at either end of the tank and one in the middle. There has been zero apparent aggression, but 2 days ago something caught my eye deep in a rock pile. A BABY JULI! I don't know if there is more than one as I have only seen one at a time. Today it came out in the open and I got a good look at it.
There are calvus in this tank, so any siblings may have ended up as a lunch. This one is about 1/2 "+ long.
I had been waiting for the julis to start killing each other off as soon as the first pair formed, but as I said, there has been no aggression since that brief lip locking 3 months ago.