I recently picked up a Kaweco Sport, which seems to have a slight flow issue (skips and hard starts) when writing normally, but which disappear when reverse writing. Has anybody had any experience with this sort of phenomenon, and what is it likely to indicate is the underlying problem? Does this suggest it is a flow / dryness issue, for example, that could be solved by making the nib a little wetter (writing in reverse obviously produces a finer line which does not need to draw as much ink)? Thanks in advance for any advice from more experienced pen maestros...