Hm... the Bf 109 in Chalais-Meudon was the V24 with 15,1m2 wing, on the slots report says:
"Der Vorflügel war während des grössten Teiles der messungen im eingefahrenen Zustand blockiert. Stichmessungen mit ausgefahrenen Slot ergeben in beiden Fällen etwa gleich grosse Ca max Werte."
And these are measurements were done at low mach numbers.
Regarding the rest, if I multiply claimed 191,9kg/m2 wing loading with the wing area of the Bf 109K, 16,05m2, I get 3080kg while the claimed loaded weights for the K-4 were around 3300-3400kg ie the fuel tank must be about empty. In the case of the P-51D claimed wingloding corresponds about 9377lbs ie fuselage tank about empty but wing tanks about full. Calculating the weight out from the claimed power loading reveals something else...
edit: corrected a typo
