The other option I think would be good for Corribra instead of the Expert Pilots rule would be to give them +1Ld to RO. Considering ordnance is what Battlefleet Corribra knows and also that they have made do with replacing damaged weapons with launch bays, launching fighters/bombers/assault boats must be totally second nature to them. I am not really sure about the Excellent Pilots upgrade because having a whole fleet with this much ordnance and resilient fighters may be overpowered. Considering there may be a Nemesis, a Jovian, and two Dictators in one fleet, you won't need that many resilient fighters to tip the ordnance meta-game in your favor. I think the Corribra fleets should still need lots of ordnance to play to their advantage. The Expert Pilots rule would actually allow you to play with less ordnance if it is mandatory. Personally, I think the +1ld to RO should be written into their rules and allow for Excellent Pilots to be a purchased upgrade, possibly an upgrade a secondary commander can take, or an upgrade only the Ld10 admiral comes with, representing the best pilots being picked for the admiral's ship. This could be an upgrade that costs a certain amount per launch bay strength on the ship to keep the cost appropriate.
The +1Ld to RO would more so bring consistency in ordnance launching. Let's leave resilient for the other fleets and just bring the consistency of the regular IN ordnance for Corribra.