[Andy10v]

First upgrade would be a set of track orientated pads (Black Diamond performance pads are a "fast road" pad iirc), DS3000, Carbone Lorraine RC6, Carbotech XP10 (or 12 due to weight), Pagid RS29, EBC yellow. The next thing is normally boiling the fluid so you may then need more heat capacity or cooling.

Do the K sports have dust seals? You want dust seals on a road car.

I would be tempted to get a set of Porsche Brembo calipers like the UR guys do as they are designed for road use if you want to change the calipers. Track calipers if its just for track use.

RS2 has brake cooling scoops on the wishbone, you could also fit ducted backing plates.

Most road car setups will not last long under hard track use, tyres will overheat quickly as well if you can stay out longer, its an expensive slippery slope!