I started running my car with the servo saver set pretty loose and I used the same saver for the entire summer on astro turf with mini spikes. The downside was a lot of wheel wobble in tight and fast corners. The last couple of months I tightened it up a lot to get better steering response. The downside then was I broke three savers in a short while, in some pretty nasty crashes though. Since last week I use the Tresrey arm and I noticed the servo horn had moved one tooth which I guess is because of the heavier load on the horn, so now I'm waiting for a alu horn to fit. Let's just hope the servo itself can handle the full load.
I guess the Durango team drivers don't crash as often as some of us, which is why they never found the saver to be a weak spot. And I guess they think it's better to leave these kind of upgrades for the aftermarket.
Just my thoughts