If I shake my Arab it will leak, or rather throw ink all over the place. I made the mistake of journaling in bed the other day and moved my hand across the page quickly and ended up throwing a large drop of ink onto my sheets staining them green as I have it loaded with J Herbin Lierre Sauvage.
Other than the smell that is the only complaint I have about the pen.
I have the opposite problem... mine are too dry unless I fiddle with them and adjust the nib/feed to get enough flow to keep up with my writing let alone keeping up with flexing. If I don't use them continually, they can be slow to start. I have done some scrubbing of the feeds to make sure there were no oils in them, but I haven't tried them again. I am going to wait to try them with an eel ink.