Oh my god there is so much fail in this thread.
By lowering the recast of Berserk, and not stacking it with all your other job abilities at once you are gimping your damage? Are you insane? That is just completely incorrect.

Firstly: You don't even need agressor inside abyssea.
Secondly: If you don't have the skill to hit two different macros at two different times then quit the game and go play Hello Kitty online.
Thirdly: The damage you gain by having berserk up for longer (or rather not having berserk for shorter) outweighs the effects of stacking it with every other job ability you have.

But you must be one of those wars who thinks that because they stack all their JA together for one weaponskill every 5 minutes that they are an insane damage dealer and absolutely kick ass. Go home.

Edit: You're also using Sekkanoki wrong.