Tuning with jets, Power valves and an O2 guage

Here is where things get really weird. I have no way to explain it either.

I did a compression check an hour ago. I duplicated the conditions I used during the other times beforehand with the '509 cam in place. Cold engine with all the plugs out.

509 cam:

#1: 188 #2: 188
#3: 185 #4: 190
#5: 188 #6: 189
#7: 185 #7: 190

Lunati cam:

#1: 190 #2: 190
#3: 189 #4: 190
#5: 192 #6: 195
#7: 190 #8: 192

Yeah, I was surprised too. I mentioned earlier that I had tested #6 and recorded a 173 number. It was a typo. It was #5 and I have NO idea why the number came in so low. The engine was still warm though from a test drive. The engine knocked with an average of 188 per cylinder with the '509 cam and now it is 191.
I checked these numbers twice today because I simply wasn't willing to believe it. I was really hoping for there to be something else to fix or change, but I am back to where I was before: Too much compression for the available pump octane. I might run up and get a jug of 110 octane leaded and see if the knocking stops with that. I'll pull the O2 sensor to avoid contamination of course.