Was me that wrote an 8gb image to my 16gb card, fixed it eventually though using CLI PFSDOCTOR and the Fixhdd , back to 16gb with 8gb used, tried adding/enlarging partitions but no go as it messes up other partitions, but at least its back to its correct size and pfsdoctor sorted out quite a few errors., 2 really usefull programs.
FixHD size works fine but where you might come into issues is if you don't use an updates scsi device when trying to work outside the 8GB you might get 4GB overlap and also different HD prep tools are not cross compatible, so if the original prep was done with HDinstallTools and you use HDtoolbox to add the extra partitions you'll bork it.
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Also resizing a partition destroy the data.