As a matter of fact, I made my own custom pads out of 3mm brass sheets which works 10000% better than anything else I've tried.
They have so much bite I've had to back the cable tension off to prevent them locking up. Solid brass is the way to go.
Here's a pic of the brass brake pads I'd created earlier.... it's a simple Dremel effort that took no more than 5 minutes per pad. There's a few different ways to do it - u can either make each pad out of 2mm or 3mm thick brass sheets, or make them out of thinner 0.5mm / 1.0mm sheet and just use them as liners over existing stock pads...