According to the manual, the 415MSX & later are supposed to be set at 10 degrees towards 11 o'clock. Check the bottom of page 15 at the following link:
http://www.tamiyausa.com/pdf/manuals/49419ml.pdf
Jilles Groskamp told me the 416 should be set to 11 o'clock too (against the instructions). You really want to setup your servo link length so the saver is perpendicular (right angle) to the link when the steering is centered. This makes your initial steering more symetrical. From there you need to set your end points to give you the same turning radius at full lock in either direction. Then you adjust overall needed steering on the fly with dual rate.