Tomest, Your guitar definitely needs a major setup as just the change from the UK to SA can be enough to throw out the setup on a floating bridge guitar completely. Changing strings to a different gauge or even a different brand can throw things out radically too. On the bright side, once it's set up properly, a floating bridge like a Floyd Rose stays stable and keeps you in tune like nothing else.
I don't know any luthiers out your way specifically, but there must be a few guys. The best thing to do is phone around the music stores closest to you and ask about competent luthiers. Make sure they know you are talking about a guy for an electric guitar with a floating trem, as there are world class acoustic luthiers I would not trust with an electric guitar (and vice versa).
If you want to learn how to set it up yourself, take a look at the following basic guide:
My basic setup guide
...but for the absolute best guides on how to set up a Floyd Rose equipped guitar The Jemsite articles section