[Chaos]

• Chaser from 140% at final rank to 120%.
  
• Rising Tide from 160% at final rank to 145%.
  
• Elemental Rave from 170% at final rank to 155%.

I'm gonna have to disagree with this, especially with your assessment of 'they (reaver autohits, sounds plural here) cause knockback/knockdown'. Rising Tide and Elemental Rave lack effects that justify slashing their damage modifiers. In Elemental Rave's case, its additional effect can turn out worse than a standard use.

Chaser is a more understandable case, since its the one skill that can knockback and knockdown all at once, but this is assuming that both the user and the target are airborne. This requires setup that usually demands you to be adjacent to the target, and unless you're using a 0~1m airborne enabler against a Corbie or an 'always airborne' monster, you aren't going to get Chaser to KD/KB for under roughly 6m without triggering Combination Fighter's significant damage penalty, and that point, your 140% becomes a 105%.

I'm not too sure about Snake Dancer, given that it has numerous countermeasures, and Soldier's Watchful Eye is too easily sidestepped to reinforce it.