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Gerry,
The stiffness is due to aerodynamic control loading
at higher speeds combined with the short lever arm on the
sticks. It's common in the IV and ES. My understanding is that it
was a significant enough issue in the Columbia that a servo tab was added
to the ailerons to reduce the forces needed in the roll axis in order to appease
the FAA.
I have an S-Tec 55 on my ES and have had no problem
with it turning the plane at any speed. If your A/P is rough, you might
want to check the tension on the cable running between the servo and the pushrod
it's connected to. I had sloppiness in my pitch control on A/P after
flying for awhile. My cable had stretched a bit and needed to be tightened
up. It's been fine ever since.
Skip Slater
N540ES
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