If this is anywhere near accurate for our motors, then even mine running I think 8.5:1 CC and 18 PSI Boost, I am seeing an actual 18.9:1 boosted compression ration!! Crap that is a lot, no wonder folks are lifting heads and blowing HG's on a regular basis, with stock engines/hardware and boost increases like we have with various pulley combos!
Looks like a lot of people are probably experiencing detonation big time if they are not using octane increasers of some sort and running upwards of 15+ PSI of boost!