Is the strc steering rack a must have? How about their hinge pin supports?

I want to make my truck as bulletproof as possible before I start running the crap out of it.

I already added front and rear swaybars, ft aluminum wheel hexes, ft lower shock mounts.

What else should I be looking for? I believe the rtr comes with the V2 slipper already but is a center diff a better option for racing?

Also should I ditch the stock rtr shock oil and redo them? And if so what is a good setup? Losi 35 front and 30 rear sound close? Rebound? Half, full or none at all?