Yea i think to carrers are op atm. What is even imho worse is not the raw power which is alone op but the hidden perks:
1- If you win by a good margin, no repairs!!!. This makes a huge boon , i had my carrer fleet destroy 8 enemy fleets in one round, taking no dmg as only the fighters got killed. with normal ships it wouldnt be possible, i would take dmg each fight and would have to head back for repairs long before the 8 fights,
2- The automatic instant upgrades of fighter weapons.
3- That is not an op feature but lets not forget all the all-fleet assist moduels boost all the fighters, becoming a deadly force mutliplier with the number of fighters.