John F

Here's my timing map. I can still get some knock on spool up (GSC S1 cams) so you could try this and maybe even reduce timing a little in 2500rpm 100 to 260 to see what happens.

C6C6CH3vo

iTrader: (9)

I would pull timing until knock decreases, fix your wideband, and optimize the fuel

pltek

iTrader: (33)

it looks like pretty agressive timing, start there, pull back

Mad_SB

iTrader: (8)

Just for grins, pull your plugs and look at the piston tops with a bright flashlight, make sure they are all the same color. If ont is significantly lighter in color than the rest you may have a bad injector on that cylinder. One of my stock injectors went bad at about 20,000 miles.