I use yellowstuff track pads on the road, and they work 99% from cold, so I'd give them a try.
On the gf's astra I fade the brakes all the time, they are 236mm vented, with greenstuff pads, other astra owners rave about these on astras, but I've now got 288mm with redstuff to go on, which again work perfectly from cold.
tabetha