So, while I was in library earlier today (whenever I study in library more than 2 hours my brain becomes hyper active and begin coming up with crazy ideas), I came up with this build:

And this is the result very first pug drop:

Note that I clearly remember that I NARCed the enemy Hunchback and their two Stalkers. Notice their damage.
I practically removed them out of combat.
And that's when it dawned on me. This is the perfect build to counter Direwhales! A high-speed (in terms of an Assault) 'mech that could sustain the first few second of a Direwhale's wrath, plant a NARC on it, then reign hell from where the whale could not reach! And four MLas is more than enough to handle the knife fight. Of course you should stuff your face with coolant, but other than that, this thing is insanely good.
Okay. Now you have my secret, let's go slay some whales, shall we?