The unique (gimmick) standing blocking neutral doesn't combine with single elemental damage mods, e.g. if you only have a Cold mod equipped, the standing blocking neutral procs both cold and elec. The Korumm's standing blocking is unfortunately terribly slow, even at a 1.55 attack speed. The best thing to do, if you have a combined element, is to simply trigger Influence with the standing blocking neutral, then do the usual W+M1 (W+E in this game). Spamming the standing blocking neutral is possible, just know the attack speed isn't fast, even with max stacks for [Berserker Fury]. Range mods don't increase the ~10 meter slam radius for the standing blocking neutral, so if you use it, know it'll only benefit neutral combos.

I personally recommend you just use elec only. Going for a combined element and making use of the blocking standing neutral seems like a good idea, but it's a lot of work for the same reward. It's especially bad if you use B. [Fury] because without the attack speed buff, the standing blocking neutral is just painful.

Replace [Organ Shatter] with [Galvanized Steel]

Replace Elementalist with Galvanized variant. [Weeping Wounds] is optional if you have a status chance increase of at least 240%, maths below:

2x 60% (dualstat mods) + 60% ([Boreal's Contempt]) + 120% (G. Elementalist) = 300%
30 x (1 + 300%) = 120%

Without [Boreal's Contempt] it's a 240% increase
30 x (1 + 240%) = 102%

You can replace [Weeping Wounds] with Condiiton Overload if you have a primer or with [Organ Shatter].

Boreal's Contempt can be replaced with something else like [Gladiator Might] or whatever u want.

Berserker Fury can be replaced with Primed Fury for consistent attack speed

Vicious Frost can be replaced with Virulent Scourge to create Gas instead if you want

For the Exilus Mods, Tennokai mods are always good. However, you should only use Tennokai mods if you plan on doing W+E light attacks after triggering Influence. Another option could be Guardian Derision if you plan on using the standing blocking neutral a lot.