I've got no idea if K4PC always renders mobi/KF8 as full justified or not. Each Kindle app and Kindle device and Cloud Reader has its own software/firmware and can render mobi/KF8 a bit uniquely. My Kindle for iPad app for example has the option to use the publisher's settings, but I don't see this option on my K4PC or my Touch.
I wouldn't use Word to create mobi/KF8. That is a terrible editor to use for custom book settings. If you can, it is better to create an ePub and convert it. Sigil, freeware, is a good WYSIWYG ePub creator and editor.
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