KG 53 was subordinated to IX. Fliegerkorps/Luftflotte 2 through May 1941.
Gen.Kdo. Fliegerkorps IX
(FpN: L 32688)
Formation. (Nov 40)
Formed on or about 16 November 1940 at Blomendaal/Holland by renaming and expanding Stab/9. Fliegerdivision, and assigned to Luftflotte 2. The first reference to the change in designation in KTB/OKW did not occur until 23 October 1940. Although taking part to the fullest extent in conventional night bombing operations, IX. Fliegerkorps specialized in anti-shipping and mine laying in the Channel and in the North Sea. From June 1941 it was the only Fliegerkorps in the West until 1944. Under Luftflotte 3 from June 1941 to 1944.[1]
[1] G.Tessin-Verbände und Truppen der Deutschen Wehrmacht und Waffen-SS 1939-1945. Teil 14: Die Luftstreitkräfte; W.Ramsey (ed.)-The Blitz Then and Now (volumes 2 and 3); KTB/OKW 1940-1941 Teilband I, p.125.
You were just one Roman numeral off -
L.