This build uses perks that allow you to spam heavy attack consistently while staying at 3x combo and always triggering Incarnon mode without building combo.
EVOLUTION GUIDE
Evolution I : Incarnon mode - heavy attack at 5x combo to transform into Incarnon mode, where you will receive a passive +40% attack speed and +2 range. This basically allows you to drop attack speed and range mods on the melee.
Evolution II: Whirling Fury - additional +20% attack speed to bring total of +60% attack speed without mods.
Evolution III: Adept Reflexes - +15 initial combo. Combined with corrupt charge, this brings initial combo to 45, which hits the 3x heavy attack multiplier mark.
Evolution IV: Swift Transmute - transform at 3x combo. Always transform on initial combo heavy attack since you always start at 3x due to adept reflexes + corrupt charge
Evolution V: Kinetic Harmony - +100% heavy attack wind up speed. Great for heavy attacks and stacks with [Amalgam Organ Shatter]