True - I'd largely forgotten about that winger - I guess with his two strikers you need 3DC's if you're going 3 at the back, but to cope with the winger you'd want a DL or DML to take care of him, so 4 defenders would be better, like you said.
You could use a 3-5-2 v style except instead of a DMC you could use a DML. That way you can have 2 strikers and 2 wingers to try and get through that 5 man backline