I did some parsing recently and found that Fists of Fury procs twice as much when using 1h. This leads me to believe that 1h is better than 2h unless Speed Focus or Destructive Force is going. It's hard to test if the benefits of Fists of Fury are enough to put 1h ahead of 2h since I do not know of a place with a combat dummy where buffs fade. Has anyone else looked into this? Is it worth switching to 1h when SF and DF are down?