i wouldn't run bulky qd + roost volc without hurricane, stuff like terrakion is so prevalent and other double resists to fire/bug like dragonite and salamence are gaining steam again now that the lando-t craze is dying down...honestly i feel like most of the time the extra coverage that one more attacking move provides volc is far more important than having instant recovery, especially when the coverage move actually can nab you some hp like giga drain does. i know some people who swear by roost volc however