Old Blood Changes opened a whole new World of Builds.
[Gram Prime] may appear a bit weaker then before but with new CO it has more potential.
Also with animation canceling with dodge rolling now, [Cleaving Whirlwind] is the top dog Heavy Blade Stance imo.
Dont forget to use as many Gladiator Mods as possible on either you not used Melee Weapon or [Helios] [Deconstructor]!
Its also an option to put some on your Frame or even swap [Organ Shatter] with [Gladiator Might] and you are safe to hit Redcrits.