Thanks for a very well-considered article - indeed, it is an art. I must admit I wasn't aware that the lobs would emerge on cold evenings, so I've learned something. I must give it a go.
But just a couple of things that have helped me in my worm grabbing; I don't wear gloves - that's just a personal preference, but I think it vhelps me gauge how much of a squeeze I'm giving them.
And I also have a kid's seaside bucket, a really small one, which I fill with gardener's silver sand and then attach with a loop of string, via the bucket handle, to my belt. If my hand gets a bit slimy, I just dip it in the sand to re-establish my grip.
I agree totally with the storage methods you suggest; moss, which can be gathered in any shady woodland area.