Adjust the bounds for how far books can sway

Change-Id: I1e4a56cf8df900d7cfeccc9ab323e9af2c71a73b
diff --git a/carousel/java/com/android/ex/carousel/carousel.rs b/carousel/java/com/android/ex/carousel/carousel.rs
index c265383..0f0cbb4 100644
--- a/carousel/java/com/android/ex/carousel/carousel.rs
+++ b/carousel/java/com/android/ex/carousel/carousel.rs
@@ -449,8 +449,8 @@
     float sway = 0.0f;
 
     if (enableSway) {
-        const float range = M_PI; // How far we can deviate from center, peak-to-peak
-        sway = M_PI * (logistic(-v * swaySensitivity) - 0.5f);
+        const float range = M_PI * 2./3.; // How far we can deviate from center, peak-to-peak
+        sway = range * (logistic(-v * swaySensitivity) - 0.5f);
     }
 
     return sway;