replace the steering servo of savage is a good idea
Anyone put the extra cell (6v I think) cell set up in it to see of that helped. The steering servo is rated twice, one for the standard and one for the extra cell configuration.
Here are the spec for the servo
High torque steering servo (rated at 70 oz./in. & .20 sec. speed @ 4.8v (4 cells) or 90 oz./in. & .16 sec. speed @ 6.0v (5 cells))