As someone who has played Monk since I started, and dedicated quite a lot of time to it, I can attest to the fact that there does need to be a bit of a buff. While I agree, during a static fight, where the boss just stands there and takes it, my DPS is always the highest in the party. But in fights where the boss runs/jumps away, it is exceedingly difficult to keep Greased Lightning up. Monk is advertised by everyone to be the highest DPS in the game, hands down, no arguments, game over, but that just isn't the case with most of the higher content fights, like primals. An increase in the duration would be awesome, by a couple seconds, or the stacks only falling off one at a time every 12 seconds, I would be ok with that too.