Well, I don't know what the 'real world' answer to this is -- whether the Hurri really did have this constant right-roll tendency or it's been modeled incorrectly -- but I have the exact same problem. I've gotten around it by programming a 'manual aileron trim' into my TM Warthog that allows me to essentially offset the center position of the stick's roll axis to compensate for the right roll tendency. Thus I can just trim the roll out as if the Hurri really had aileron trim available.
Not completely realistic, obviously, but fixes a behavior that seems unrealistic to begin with.
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