I'm not sure why this game is having a hard time implemamenting a fair exp system it's not very hard.

1 point of exp for every 10 points of dmg..... = 100k attack = 10k exp, 300k attack = 30k.

(half the exp for a loss)

Bonus exp for ship-class specific scoring....

dd's & CA's cap islands,  CL's AAA, etc.

Also NF1 had it right in that cv's were real cash cows for credits.