I don't know how to do triple midpoints. I can only try from the basic information provided by astrodienst. If I take under 1 degree conjunction midpoint as the representation of Sun, Moon, Mercury, AC...
Sun=Venus/Polis 0 degrees 36 mins
Venus=Neptune/Part of Fortune 0 degrees 21
So Sun=Neptune/POF then /Polis
Moon= Neptune/Lilith 0 degrees 7 mins
Neptune= Pluto/Lilith 0 degrees 49
So Moon= Neptune/Lilith then/ Lilith ? Look very psychic to me
Mercury= Pluto/Mean Node 0 degree 39mins
EDITED Pluto= Mean Node/AC 0 degrees 13
So Mercury= Pluto=MN/AC then /Mean node
AC=Mercury/POF 0 degrees 50
AC= Uranus/NN 0 degrees 56
Uranus=Sun/Neptune 0 degrees 26
......got very complicated here now, but I think that is as much I could understand at this present moment
I wish Rahu use POF so you can interpret what is going on so many POF midpoints here
. I like this one here: Venus=Neptune/Part of Fortune 0 degrees 21
Thank you for the hints see if I can work more on these.