It seems there's no reason to have slam in your rotation.
- With our new Fervor of Battle talent, Whirlwind does more damage than slam, in non-crit damage and Crit damage.
- In addition to Slam, Whirlwind also triggers our new trauma talent. (bleeds)
Extra observation
- Whrilwind does more damage with Fervor of Battle than using it during Avatar (however Avatar does increase all skill damage and not just Whrilwind).
Notes:
Testing was done using the lv 102 Garrison dummy
All testing done was single target damage
I only used the in game combat logs to test numbers (no addons etc)
I used battle cry to test crits