f44? That's your problem. Each f-stop cuts lens resolution in half. It doesn't really matter until f/11 or so with current digital cameras, but past that you'll start losing sharpness. Try f/8 or f/11 instead of f/44 and you should see a sharper picture.
Diffraction is a very real problem at very small apertures, but it sounded like the original poster was seeing motion blur, which is a bigger, and more visible, problem.
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