I see two problems.
First is, they'd have to want to change. All the paraliminal tapes are fairly general, although some are more specific than others.
Second is, with a charming psychopath, they'll be able to fake the change you want to see.
What would be interesting is seeing what works and doesn't work for any psychopaths who may be using paraliminals on their own. Obviously, if they have radically different neurologies, the same strategies aren't going to work. That's why I don't recommend "Get Around To It" to autists (I recommend "Natural Brilliance" instead, because what appears to be "procrastination" is actually a "stuck state.")
Because psychopaths lack the skill of sympathy, perhaps "Relationships" would be the most interesting Paraliminal to study.