Items not standard are plastic shock towers, no 20 gram weight, 4wd rear arms, new vented slipper plates. I use losi oil and I also widened the rear with 1.5mm wider rear hex's. this brings it out to max width.

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Why did you use the 4Wd rear arm with the Evo chassi? You have a short chassis (longeur bettewen the front and rear weels) than the original rear arm arm with the stantard chassis?
I just tried them one day and really like it. I'm not sure why but I get much better drive out of the corner and it jumps better.

I mount them the same way they would go on the 4wd so I had to drill the front of the arm to mount the bottom of the shock. In the middle position its the same wheelbase as short on the normal arm.

I had to drill the outer pin hole to the same 2.5mm that the normal arm has as the 4wd is just 2mm the pin fits perfect when you take the E clips off. I use the same hub and CVA it just allows more shock up travel without effecting the angle that the CVA sits at.

Here are some pic's (bit poor on my phone) of the rear arm mod I use.
Only thing you need is part TO4008 Rear Lower Arm
Then you need to use a 3mm drill bit to allow the hinge pin to fit in. (DON'T drill all the way through just the same length as the hinge pin.