I have avant garde m310 which are very similar to the 530 you have listed went with 20s in the staggered option got 8.5" +30 in the front and 10" +40 in the rear painted in dolphin grey from ozzy tyres, tyre wise 245/35 fr and 275/30 rear. Go staggered the extra width allows a much better launch, reducing wheel spin considerably....
if I had my time again would go a less aggressive offset in the rear maybe +45 and get a 285/30 tyre in there which would have almost identical rolling diameters front to back and slightly more sidewall.
As for ozzy tyres, good luck. First set they sent me was drilled in the wrong stud pattern second, second set the painter hadn't applied a primer and now the paints flaking... Just waiting for a time where I can get them powder coated.