I certainly need to learn more about the game to fully apply the information you've provided. I don't understand the damage calculations yet, so I wanted to question AoE.
My current favorite combination is Spell Sword and Living Force. With the MH primary skill, it throws a comet (Spell Sword). When coupled with Living Force, this comet goes a little over half way to the edge of the screen (I am not sure how a "yard" is determined in the game yet), and then returns dealing 50% of the dmg on return as well. I currently use an axe as my MH weapon although, this doesn't really seem to matter what the MH weapon is, with that combo. Toss in Assault for "toss" and wrath for increasing AoE and breaking destructables from a distance, and it SEEMS like a really good combo. Secondary skill with that combo is moot as well, as Meteor becomes the MH secondary skill.
I wanted to ask how Spell Sword/Living Force compare to Whirlwind with a hammer. I am trying to build your hammer, but ran out of special crystals before I found "whirlwind". I've found throwsword, torrent, and a couple of others, but not whirlwind with a hammer yet.
The downside to the AoE with spell sword/living force is that it is stationary. You can only fire the comet while standing still, but you can move any time after releasing it. Not only does it attack forward from a distance, but with Assault added to any of your gear, the 80% chance to cast toss on attack widens and increases the damage from the comet.
Naturally, the math doesn't lie, I just don't have the information necessary to determine what the math is between your whirlwind hammer and my SS/LF combo. I would appreciate any insight you can offer.