I had 2500's, Grooved discs, racing fluid and 2 piece discs from Bill at Badger 5.
I took the car on the track a few times and I found it difficult to keep them up to temprature there were only two corners where I needed to brake.
With that said 2500's even on standard discs never had a strong bite from cold (It wasn't bad but wasn't good)
Redstuff equivalent is DS3000's and I cant imagine using those for daily use. Must be a nightmare.
On the pads your looking at however, I've had friends say they preferred the 2500's and moved to those instead, but as far as figures go I'm not sure.