Hi Stratman,
The Hurricanes and Spitfires (all marks) do not have aileron trim. Instead, use rudder trim. Also, make sure your rudder pedals are calibrated. In this sim I find my CH Pedals regularly go out of whack and need recalibrating.
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My system: i7 920 @ 2.67 MHZ, Win 7 64-bit, 12 Gig DDR3, Gigabyte GTX 680 2 Gig, Thrustmaster Warthog HOTAS, CH Quadrant, CH Pedals, Track IR 5