Delta3 - you are clearly a clever chap but not, in fact, a helicopter pilot - if you were you would know that inflow roll (or transverse flow) is a fact of life in a helicopter, even in an R22. And it's nothing to do with precession
Just because your basic physics and advanced maths doesn't reveal its existence in your modelling, doesn't mean it doesn't happen - ask why there is a lateral trim facility on the Robinson!
You'll be telling me your simulator doesn't experience inherent sideslip next