Bear, Lyman, or whoever you are... If you'd ever handled hydraulically actuated controls on an aircraft, you might have noted the same thing... the more demand there is, the more likely will the surfaces be responding a little slowly to your demands... call it a kind of hysteresis. As more fluid flow is asked for (many of those actuators use a fair bit of fluid from stop to stop!), the more the pressure can drop and the slower they'll go.