it might have been worth checking if you could just choose modules as options from sociology courses, I have a straight psychology degree but took a lot of sociology and politics modules - which I personally think (as someone hoping to head towards clinical psych) that the combination of modules I took has allowed me a much more rounded and comprehensive understanding than a straight psychology course would have, I have studied clinical psych in a very critical way, human rights, social issues and mental health etc which may be covered by some courses but weren't by mine, they also helped me think in a slightly different way, I think when you come to apply for jobs/courses what you need to be able to do is make things sound good, if you can justify why sociology helped your career and personal development then you could potentially use it as something to make you different, but it is likely to be somethign you're asked about (as it does imply a lack of commitment) so you need to think about it and try and take more relevant modules