im 60.5kg and an ok cyclist, don't know if im strong or not really. On my Venge I run a really short stem of 80mm and found that some bars gave horrible feedback with it, the only way I can discribe this sensation is that the bars felt like they had a bit of flex and seemed to feel like they were resonating. it could have been in my head or something totally different. I ended up using a Zipp stem and Zipp bars and no longer get the same sensation, even though the bars are the same width as before, the same goes for the stem... Now im building a new bike I need to decide what bars im getting, but do not wish to get the sensation I have previously.