Yeah, stay away from Distichopora, No circulation system in these guys, and need plenty of plankton and nutrients.
Those new pieces are awesome, not sure what they are though.
It does look kind of like Millepora alcicornis. If it is, then watch out for the nematocysts which will sting you and any nearby corals.
I could be totally wrong too, I'm not good at this id stuff

Mike
EDIT: After taking a look at Borneman's book I guess they are Distichopora, they look just like the ones in the book.
Wonder what those little crevices are in the specimans' you have pictures of? The ones I'm looking at don't seem to have that.