Sheeting posts

I’m about to install a sheeting post on my Mistral. As I usually overbuild I thought I would ask what you guys think I could get away with. I was sailing with some IOM guys the other day and their posts looked like about 1/4" dia. carbon tube. Is that big necessary? I was thinking that something a little lighter might act as a shock absorber for those violent jibes. Any thoughts or experiences?