The Erinyes has a bit too big butt for my taste, but it's a good ship nevertheless. A nice counterpart to the Ares with those eight primaries. Combo Maxims+Kaysers if you want to attack a capital ship (and you know how to conserve your energy

) or full banks of Subachs for pure dogfight. Full Kaysers configuration is getting quite hard to use even on Medium - no spamming, only short controlled bursts.
Ekhm, anyway, Very Easy is almost like playing with godmode on. Unless you're sitting like a duck, nothing short of a BFRed will kill you. Easy is similar. Medium is my choice at the moment. It is already challenging, but in a positive way. Though I'm thinking about moving to Hard, I guess that it can be quite entertaining to feel that survival isn't that easy there.
One more thing - some missions are actually easier on the higher levels. I guess that not only AI's, but also player's weapons are stronger. On (Very) Easy, I never managed to destroy all four turrets on the Sathanas, because the Helios always left them at like 15% and I had to destroy them via Trebuchets. Then, one day I turned on Medium and on the first try, I destroyed all of them. Kaysers also seem to be even more deadlier.