If you're running the 3A/3T stock plates or hinge pin holders as there called, you don't need the LRC pin holders. The LRC is adjustable plates with a lower roll-center than the older adjustable plates or first edition adjustable plates that they made.
I really don't see the need to change the anti-squat or rear toe on the truck or the buggy so I run the stock plates. The only way I can improve my Losi is by driving better.