Took the bike for a decent spin yesterday and gave the brakes a good test. Initial braking is excellent and instant. Massive difference when compared to OEM setup. But when pulling the level in for a longer period of time I notice a slight vibration from the front brake, not enough to be bothered about but just enough to notice it. It's probably like others have suggested that the waves are slicing though the pads causing this feel.
Good example is when I am riding at high speeds and can see at a distance the stop lights have turned red, I pull the lever and the initial stopping power is superb, hold the lever in (without increasing pressure) for 2-3 more seconds and all I get is this vibration, the bike slows down and the vibration disappears before the bike stops.
Can't really do much more apart from changing the pads to see if it helps reduce the vibration. Other option is to win the lottery and buy Brembo T-Drive rotors.
I'm open to suggestions if there are any. Thanks.