Well, your results say it's not an AH problem, but either the stick or it's calibration in Windows.
Try re-calibrating the stick in Windows, and then test it in the Windows control panel to ensure it is working properly. If everything is working great in windows, then go check it in AH. Make sure your AH setup and scalings work the way you expect.
USB is worth a try. Some folks report pauses and delays with USB control devices, but my machine works very well with both USB mouse and stick.
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Lephturn - Chief Trainer
A member of The Flying Pigs
http://www.flyingpigs.com "My P-47 is a pretty good ship, she took a round coming 'cross the Channel last trip.
Just thinking 'bout my baby and lettin' her rip, always got me through so far."
- Steve Earl