[snowolf69]

Here are the openers.
MT: tomahawk (executed by the player while in defiance to trigger the MT opener) > equilibrium > heavy > infuriate > skull > thrill > block > potion (can only be used by the player) > heavy > deliverance > maim > berserk + inner release > eye > cleave > upheaval > cleave > cleave > end opener chain
OT: heavy > infuriate > maim > eye > thrill > heavy > potion (can only be used by the player) > maim > berserk + inner release > path > onslaught > cleave > upheaval > cleave > cleave > heavy > maim > path > onslaught > cleave > end opener chain

These are the best dps openers I found and tested myself among all the ones I tested. Both of these opener chains have very specific conditions to trigger so as not to have them attempt to trigger mid-combat and potentially lock up. The conditions are basically checking for every related cooldown/buff to be available and having 0 beast gauge.