I disagree, this is what makes the most sense with the information provided.
Enlighten us, how dose that happen without fouled up cam timing?
Yes the CAM can be at 6 or 12, but if the crank is timed at 6 then the cam will always be 90 degrees off (1/2 a crank stroke) and his compression when from 120 to 60 (about 1/2).
No one is saying that this IS the problem but based on the data I think its a very viable place to check.