a mission ship or super ship as you call it, can be judged in a couple of ways.
first you should have about two times as much hitpoints as attack.
next add hitpoints and attack then divide the total by 1.5. this is about how much the total price of the ship should be.
an 8 billion credit ship should have an acc in the high 80's and abs in the high 60's.
also you never really need to build a ship with over 68 - 72% abs, because you will have enough cp bonus by that time to bring it up to the max 80%. with acc 90% is high enough to get the 99% max with cp bonuses.