My Sheffield does bite a little if I come straight off the hone and shave. Have you tried newsprint, by any chance? It's done very well for me when it comes to smoothing things out. You may also want to consider giving it more laps on the strop.
I thank mparker for the newsprint advice, but interestingly, he's mentioned that it doesn't do much for his Sheffields. That hasn't been my personal experience, though, it's helped mine quite a bit.