Do you unlock with right or left thumb?
I used to unlock with right thumb upon draw. Now I unlock with left thumb upon target acquisition.
Right thumb, because I go to a high thumb hold anyway. All those years of IPSC and USPSA, I guess.
I have practiced and can do a left thumb, if the strong hand's disabled.
Note that my Caspian Officer's ACP above is a normal single-action 1911 variant. I have no problems with that particular discipline, and it's been my concealed carry permit gun for many years. Having carried a 1911A1 as my issued sidearm in the military is certainly biasing me, and I hated my later M9. Note that I also have a Kahr K9, which was designed from the start to be a striker-fired DAO gun like the much-vaunted Glock. So you'll excuse me if I consider a DAO 1911 as something of a crude joke. Even Colt ditched their Double Eagle about 10 years ago.