There are no negative implications due to negative tiller when its warranted. In fact, if it's warranted and you tillered it positive, 'just because' like so many do, it would be unbalanced, have more hand shock that it should, treat the arrow badly, etc. Many of my bows show a negative tiller after I balance them.... even those with both limbs showing the same profile unbraced. Balance the strength of the limbs relative to your holds and there will never be a question like , 'maybe too stiff?' Cuz balanced is as balanced does. Right is right.