I kept my flight time in minutes. Been that way since day 1, especially when the glider flights were 2 or 3 minutes.
However I used the official off and on times with no 'coversion' factor to try and replicate how the FAA defines flight time. So my official military time, logged in tenths, is slightly different than my actual military time that was logged to the minute.

If any airline allows you to use a 'correction factor' that's the AIRLINE's policy and has nothing to do with the FAA or military definition of logging time.