Steering servo

[Driftwood]

Hi. I've noticed that my steering isn't very quick to respond. When I move the control stick quickly from left to right, or right to left, the steering on the car doesn't move at the same speed. When I drive the buggy I initiate a turn but the car takes a moment to change course and will sometimes turn in tighter and tighter the further I go round a turn. I've checked for binding steering joints and damage and fitted new bateries and all seems ok. The suspension is as it came from the factory. Even with the front wheels off the ground, the steering doesn't keep up with the control stick. Can anyone recommend a quicker acting servo? My buggy is a G.V. Rex-X and is completely standard.