I went and bought me dual heavies, and i got 1 acc and 2 crth. And i mostly come on this game just to pvp

Then you'll probably be ok with those mods as long as your Starship Targetting skill is maxed and you have a way of slowing down/locking down escorts. You won't miss cruisers or sci ships (too slow), but escorts might give you issues. So get a way of locking them down, and if you have the accurate trait + maxed starship targetting, you'll be fine.

Thats why I wish for a Cstore retrait respec, so I could put the Cc trait on my KDF.

In PvP, yes. In PvE you aren't really going to miss, outside of shooting down torpedos. The ACC spillover into severity isn't as efficient as a pure modifier unless the target has a negative defense modifier (ie he's tractored or has no engines)

(Dmg) is only good on 2 weapon types Polaron and plasma and that's only because it increases the magnitude of the proc. so the dot burn is higher and the energy drain is higher. Mind you dmg only really works on a subnuked tractor tgt

Acc is only good on an escort in pvp a sci ship is best outfitted with crtH. because tractored tgt have almost no def rating you won't miss anyways so crits make the world go round on sci pvp