5-5-4 seems to be working ok for me but I like the rear a little more planted for large outdoor tracks. I might have to drop it to 5-5-3 or 5-5-2 for the winter indoor tight tech track, but that track is very high bite indoor clay so the car stays pretty planted.

The email I read with advice from Easton said that the diff oils didnt play as big of a role as the correct shock and swaybar setup. Of course you cant go extreme but I think you get the picture.

I ran the setup I posted a couple pages back last Sat on a large unmaintained rough blown out track and I was pleased with how I was able to get around the track for the shape the track was in. The biggest thing I noticed, after my buddy pointed it out, was how the car seemed to be very forgiving and correct itself when I got it out of shape. Especially off a jump. I could jump and land where it looked like it would spin out and I hit the throttle and the car straightened out. It was almost like magic

For large outdoor tracks I would start at 5-5-4 and then adjust from there.