Personally I don't think any A-level subject is a "soft" subject. You have to put a lot of effort into getting the grades you want for them all..
I'm in my final year at secondary school and have applied to do English Literature, Pyschology, Sociology and Law but I might change Law, idk yet.
With what I've heard, many people believe Sociology is a soft subject. I take it as a GCSE, it's not.
So my advice would be don't worry. I don't think any sixth form subjects are soft, people just assume they are.