Just FYI. There is supposed to be a certain layer of pad material already on the surface of the rotors. This is called a transfer layer. An uneven transfer layer, as many have mentioned, can very likely be the cause of your issue since it fits most/all the symptoms.
This transfer layer is important for your brakes to function properly. Before you re-bed your brakes, a lot of track people (particularly people like myself who reuse rotors with different pads for the track) would recommend scuffing the rotors with some medium grit sand paper, if possible. I understand not everyone has the tools required to take rims on and off at a whim but it would help with your re-bedding process to make sure most of the original transfer layer is gone. Mind you, you are mostly just scuffing the surface of the rotor to give the pad a cleaner surface to transfer to. You are NOT trying to reshape your bloody rotor yourself (good luck trying to anyway with sandpaper but I just thought I'd mention it).
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35% Hooper Optik | Takeda Attack CAI | F.I. HFC | Hotchkis Sway Bar | Stillen 24row | OS Giken Super Lock LSD | TK Shift Knob | EVO-R Carbon Diffuser
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