Brakes Overheating?

[Asahi]

Fitted new ATE discs & Bosch Pads week ago. The Passenger side has a discloured streak in comparison?
I'm thinking contamination or overheating but I'm no expert. I wiped it with a tissue and brake cleaner. Tissue came off abit black, I thought brake dust but the other side didn't produce much.

Front Pas Side

Front Driver Side

High Res Album

Any Ideas?

 

[Retroman]

To me it looks as though the silver coating (Geomet 360) http://www.nofmetalcoatings.com/europe/en/coatings.xhtm hasn't completely worn off yet suggesting the brakes haven't completely bedded-in. If a caliper is binding, the wheel would get very hot to the touch - I've seen plastic centre caps melt and fall out when this happens.