I'm surprised stem flex is an issue. It you're getting some flexing it might be worth going for heat treated Nitto bars?
I was talking about those old common stem/bar that does have noticeable flexing, modern bar are much better naturally, but some people does feel a slight difference between modern quill/bar and ahead stem/oversize bar.
I was talking about those old common stem/bar that does have noticeable flexing, modern bar are much better naturally, but some people does feel a slight difference between modern quill/bar and ahead stem/oversize bar.