Seems to be little point being a CV against submarines. The only thing that I have found that can hit them is the bombs from the british line, the bombs from the two other lines, the submarine is just to hard to see and drop on. Fighters are worse, as the sub is smaller than the reticle we get, far to small a surface area to see, and the sighting distance is abysmal for us to counter.
Just left a game where I was left against 3 subs. They just capped, sailing slow, diving when fighters came to close, and pop right back up. Nothing at all I can do about it either.
So if CVs are going to be in games with submarines, something needs to change. A larger wake, something. Or we can just figure that CVs against subs we just give up and call it a loss.