Yeah, doubt it's the K&N- you might be a tad lean but not that badly. But idle's too low- when fully warm it's supposed to be, what is it, 12-1300? I have mine at 1300 anyway, seems happiest there, but then mine's maybe not a good example

The adjuster's down the left hand side of the bike between the frame, it's a wee black dial. Should be connected to the frame in a little bracket but they often aren't. Just give it a wee spin and see what happens