Great addition really makes the tech tree easier to read.    

Just a small point for basic logisitic it's not very clear that you only need basic logistic for life support and bigger hulls tech and not the entire logistics techs. Same thing for the counter espionage tech you don't know how many diplomatic techs you need untill you've researched far enough for the tech to be available.

Migth be clearer if the arrows branched out of the specific prerequisite tech if it isn't the last of a group or else maybe seperating groups of thechs so that all the points where the tech tree branches out are the last of group (ie: separating basic logisitic from the other logisitic techs)

Otherwise maybe the planetary techs and the technologies envolved with tech victory could be colapsed.