As you may have seen, everybody is confused.
I had the TT arms on my agenda and today I saw that they do not fit the same for everybody
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For fuscobal, with GTI hubs, the TT arms are working fine (as intended). Camber is -2.3'.
For danishmkvgti, this S3 hubs, the TT arms can not be installed correctly but they are ok the way they are.
I would definitely get the TT arms (and I will very soon). Since you bought the S3 hubs, I would use those. If I were you I would also sell the S3 arms.
Camber is crucial on the circuit and all cars have negative camber (more or less aggressive). Please look at WTCC pictures, Formula 1 pictures, Formula 3 pictures tc.