For the preview position in the lockscreen/status area notification, in the first post you wrote that the file to delete is /usr/share/themes/sailfish/meegotouch/libmeegotouchviews/style/mbannerstyle.css, but this one is identical to the original in the base theme, I conclude therefore that isn't it.
Are you sure that the above is the file contains the shift to the left position of the preview?
If I want to only shift to the right the preview text without delete the file but only editing this one?