Ok I know knock questions on here are like a broken record. I have read several posts by searching but cannot find one quite like this. Anyways I have been having a knock problem. Today I was out going about 30 mph and rolled into it and it started to knock. I was running about 21psi on 110 octane gas. O2s were 835 but the knock gauge was deep into the amber and it retarded 9.1 d. So I came home because I figured it had false knock because the 02s were so high. I then lowered the boost down to about 15psi still on 110 and took it out for a couple runs. The first run I rolled into going about 20 mph and it slightly knocked still in the green in the gauge and it only retarted approx 2 degrees. Then I stopped and left at about 1psi and when I let it go it immediately went strait into red on the gauge and retarted 12 degrees and the the o2s were at 385. The boost on that run was still lowerered at this time. So I have no idea where to start. The o2 sensor is pretty new. At first I thought I had some false knock because of the high 02s then after that last run I dont know what to think. If you have any ideas I would love to hear them.