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I'm trying to figure out the best method of delivery, so that I can draw in the largest audiences.

That's a tricky one. Perhaps tagging in a few communities that are relevant is the best approach. You could try promoting your post too. The more people that reblog, the wider potential audience you will reach too. You could also put links to your short stories at the bottom of each of your posts to promote them. I have seen a number of people list a selection of their material at the bottom of each post on a regular basis. Best of luck!