If it was the cam angle sensor it would most likely pop up under the diagnostic menu on the logger. Another obvious check that you probably already took care of would be the gas. Sure its 93 oct? How old is it? Maybe the ECU? I might have another knock sensor laying around here somewhere.

Is it a lifter knock? Where is it coming from?

He is referring to the registered knock sum appearing on teh datalogger. Spy, I would also check out anything that could be hitting the back of the block. At vday, I had a a/c line hitting the sensor, causing 35+ counts at all times.