Here's the blurb that I use for feedback..it works. Under this ID I sell ebooks/recipes. I also have three other eBay IDs. And I use the below blurb on all of my auctions. It's not asking for feedback in a blatant way..it's stating the feedback will enable me to know they received their item. Hope this helps!
Please let me know when you receive your item. The best way to do this is by posting positive feedback and I will do the same for you. If there is a problem please email me and I will do my best to correct it!