the kaweco sport is not a great writer, just warning future buyers. if you want to try it out absolutely like i did, i would suggest trying the plastic version first which is much cheaper and has same nib and feed.
camelfaceI quite like mine. Smooth and consistent. Maybe you got a 'bad' nib? I will say I had a rough time with the Kaweco calligraphy nibs getting enough ink flow, but have had a great experience with the standard writing nibs (I regularly use the EF and F nibs).