Makes sense Z. The three larger BG's you mentioned give you much more opportunity to set up in a quasi-sniper position, start dishing out damage, and not be receiving any defensive response. The smaller BG's make it much more likely you'll be targeted and subsequently dispelled.

While I'm still purely in the theoretical stage (still getting set-up and haven't played post patch), I have really mixed feelings on the Fulmination mechanic and usage.