While the Kogake Prime lack an attractive statline compared to other Primed melee weapons (being strongly Status-based with minimal Crit and substandard CD and Impact-forward damage), they are still capable of being dangerous against even high-leveled, highly armored enemies. The trick is to simply lean hard into the Impact/Status traits of these Sparring braces.

[Blood Rush] isn't conferring much besides slightly faster Berserker stacks, and [Drifting Contact] can be swapped out for [Weeping Wounds] (though it'd cost an extra forma), but the core mods for this build are the Corrosive mods and [Shattering Impact].

Since the [Kogake Prime] have a reasonably high attack speed and high Status Chance, putting on Corrosive for the 80% armor reduction, compounded by the constant flat 6 armor reductions from every hit thanks to [Shattering Impact], you'll easily be able to chew through enemy armor and bludgeon them to death, potentially killing them before their health bar turns red.

EDIT: With Sisters of Parvos coming in a few days, this build will be entirely outdated; Berserker ([Fury]) will become mutually exclusive with [Primed Fury], which will free up the slot normally used for [Primed Fury]. This allows [Weeping Wounds] to be slotted in without the expenditure of a Forma, which I suspect would moderately increase the performance of the build.