Well then, 4 Malice, 4 Shield Regeneration, 2 Colonize for Progenitors by the sound of it.
I say 3/4 Malice, 4 Shield Regeneration, 1/2 Colonize and 1 Resurrection. Resurrection is quite powerful late game, the ability to treat your capitalships as expendable is a big Advent advantage. As it is currently capitalships are about the only support that's safe to bring into a titan battle, so keeping an escort of high level caps for your titan is more important than ever.
About skirmishes, they cost more because with thier cheap upgrades they become the best LF in the game. They also do way better massed damage then the other LF's as is, having a higher base damage, meaning even better damage as the upgrades progress. You don't see how good the vasari light weapons are because their phase missiles are even better(and are spammed a lot more). The vasari have all the best weaponry, which makes sense. Just build up a horde of 50 + skirmishers and face them off with another horde of another races LF (at comparable resource cost) and see by how large of a margin the skirmishers win by.
I saw a multiplayer game where a player built over 100 skirmishers, perhaps because all of his military labs got destroyed or he was seriously low on crystal. Either way, they really couldn't hold their own against an (admittingly bigger) Advent mixed fleet, and instead decided to scatter them up and drive the other players insane by sending a few to each of their planets. He had obviously lost the game at that point, but they managed to do a slight number on the victims sanity. 
