Well there are quite a lot of CVs with fighters with levels 100+ so you most likely fight against them ang get ur anus handed to you.

How many experts do you have on them? 100? 200? 0?
Besides you should think about getting more vets (consier AAing especially while the Event is still on) Preferably 150 but more never hurts.
Also... try dragging fighters it usually helps.

Also... yeah using locals in a CV higher than CV2 is kinda fail.

they all have maxed experts, ill try better tactics and increasing their vets then

150 vets should last you till CV5. besides vets it's all level and tactics. Things should improve drasticly when they hit lvl 75 and you will be cool after hiitting 90.
Before that... well you can't compete with fighters 40 levels above you and especially not with USN fighters.

Dont class as squad leaders, leave them as ace. 100-120 vets is fine, you just need to level them. Also, KM T2 fighters are quite strong just alittle slow. They will show you far more about CV play then locals ever would so I personally would recommend sticking with them instead of switching to locals. You will get farmed for now but remember its a level based game so use this time to learn to be effective with what you have.

From an experienced cv player... (KM De Grasse)

1. Get 2 more pilot's (i suggest 2 elite fighter's)
2. Level your seaman up to your fighter's
3. Get a medic!! there is no way to get around not losing vets and expert's without having a medic.
4.Vet your fighter's now too 150 vet's ish (if you do it later it is a much harder conversion rate)
**Everyone's fighter's at high level's have over 150 vet's each personally all 6 of mine have between 160-168 vet's and i still think i need more**

As for using local's...
I power leveled my 6 Fighter's to roughly Level 75-80 before i used them on any CV and so i never have used local's. My suggestion is too use them when your at the required level until you can't anymore.

You dont lose vets anymore so I would advise against a medic.

Yeah I still have a medic even though vets don't die anymore. I guess it was all the trauma SDN inflicted on me back then hehehe.

So the medic is still there. Prevents expert death I guess. Even though you can get experts easily enough with AAing.

seriously i virtually have a useless medic?

I'm doing the same thing, I actually used the T1s instead of locals and now I'm on my way through the T2s (68 atm) but it really isn't worth using locals IMO. I used elites BVE'd like you and with T2s (and even T1s) you should be able to down some T3s and you can actually help your team by scouting with them. Nobody likes a CV3 with locals :(

The main thing when using low level figher planes is dragging them properly. They do lack speed compared to T3-4s though so it can be tough chasing bombers. Really it just comes down to timing it right so that your fighters shoot at the right time then dragging them until you're ready for another round.

As for the seaman, probably not worth your time leveling it and if you already have a KM BB crew by chance, just throw some supports on in its place.