Why do you assume it has to do with the AoA slider? Where do you have the 2 Vne Sliders? What happens when you move both Vne sliders all the way to the right?
The sliders are at what I assume to be the default settings. Vne (No Exceed) are at .81 Mach and 340 IAS. Just a slight climb or angle of attack with a IAS of 200+ I had buffeting, so I don't see how those would come into play.
So I loaded the flight and double checked the Vne settings anyway and retested this morning. Today the aircraft flies just fine with AccuFeel. Yesterday when this first occurred I did a reboot of the Pc and restarted FSX and the issue was still there. Today, all I did was start up FSX (shut down from yesterday), verified that AccuFeel was enabled and the settings for AOA and Vne's were at default settings and did a take off like yesterday from KSEA.
Working fine from any other random location as well. Not sure why I was seeing this yesterday nor why the reset of the pc and fsx did not clear it up yesterday, but today the issue is gone. Hopefully it stays gone, or I can figure out what triggered it to happen.
Ending on a high note, this was the first and only issue todate that I've had, this product adds alot to the simulation experience, nice job!