Yours is a different description of the 'compression' than I've seen before. True I haven't read any Kelly Johnson papers on the subject. Maybe I should.
Again, as stated repeatedly here in this thread, the truth, the absolute gospel on the P-38, can be found in the book "The Lockheed P-38 Lighting", authored by Warren Bodie, A Lockheed engineer, who had for sources almost all of the original design staff, and almost all of the original test pilot crew. Bodie had access to the Lockheed archives, Clarence E. "Kelly" Johnson (the man who is considered the father of the P-38, along with the U-2, the F-104, and the SR-71), Colonel Ben Kelsey(the USAAF test pilot and liaison to Lockheed for the P-38 program), Tony Levier (who ended up with more hours as a P-38 test pilot than anyone, and who raced one after the war), and a host of other people too numerous to mention. Bodie goes in to incredible detail in describing what really happened during the 8 years Lockheed was designing and producing the plane, covering in detail the issues with compression and with the dive flaps, as well as engine development,and just about everything else relating to the P-38.