So...after finally reading and paying attention to a few forums, it seems that the skulls don't mean that much, except maybe tonnage.
Don't care how good you are, when you have EIGHT (8) heavies and assaults ; 4 to your front and 4 to your rear, coming at you at once, you are in for a bit of excitement.
After flying around the known universe I have ONE new module. A Heat Exchanger, never had seen that before.
Oh, and be seriously afraid of getting in front of Nix and Behomath. AC 20+++ hell for you.
POP!.. goes the Weasel.