His date of rank (DOR) as a Major was 01-10-1935 (4b). In the 1935 Stellenbesetzung he is shown as still a Hptm., which, along with the "b" in this DOR, would indicate he was promoted after 01.10.1935 and given a back-dated DOR.
In 1935 he was on the General staff of II. AK and in 1937 was in the 6. Abtl. d. Rw. Min., which seems to conflict with your information below.