Another possibility could be The Sword Sings from Fatesinger. "Deals +50% Damage. +4 Critical Threat Range. Your weapon swings with the power of song, causing an additional 2d10 Sonic Damage per Character Level that scales 200% with Melee Power. Critical hits cause the target to be Stunned for 2 seconds, no save. On use, you gain a stack of Chords of Fate. Chords of Fate stacks lasts 30 seconds and stack up to 3 times. Cooldown: 4 seconds"
It's a "builder" attack for another attack in the next tier of Fatesinger, but by itself it's very useful, especially when leveling. If you're willing to add a follow-up attack to it, pair it with Blade of Discord, "Melee Cleave Attack: Deals +30% Damage. +2 to Critical Threat Range. Consumes all Chords of Fate. You cleave your enemies with the power of music. Enemies must also make a Fortitude saving throw or (DC 20 + Highest of highest Ability Score mod + Stunning Bonuses) or be stunned for 1 second per Chord of Fate consumed. Releasing 3 Chords of Fate restores 10 Spell Points. Cooldown: 15 seconds. (Unlisted: Deals an additional 1d6+1 Sonic damage per character level, scaling with 200% Melee power. Each Chords of Fate you have increases the damage by 100%.)"
Add Harmonic Resonance, "Your weapon attacks and offensive spells have a 20% chance to build up a stacking Harmonic Resonance on your enemies. Harmonic Resonance: Each stack increases the creature's vulnerability to Sonic damage by 10% and reduces their Armor Class by 5. The effect may stack up to 3 times and lasts up to 20 seconds."
You'll be building up sonic vulnerability with Harmonic Resonance, then an attack with The Sword Sings (three times if possible), finishing off with Blade of Discord. It's a total of seven points into Fatesinger to get. More expensive than Quick Cutter, but less so than Adrenaline. The only big downside is the cooldown of Blade of Discord, which is 15 seconds. You could just use The Sword Sings without Blade of Discord and by itself with the sonic vulnerability built up by Harmonic Resonance you have a pretty solid attack with a low cooldown.