Hey Uncle W!
Some flinch-fighting techniques include:
1) Practice dry firing but do it really well - really pretend that it's going to go off in your hand. Watch the end of your barrel for the effects of your flinch.
2) Have someone watch you shooting, from all angles, to isolate what the flinch is causing you to do (vis-a-vis misaiming). For example, if all of your shots seem to go to the left, get someone to watch for that.
3) Get some dummy rounds and have a friend load a couple along with live rounds into a mag and put it into your gun so that you don't know which is which. Then, when the dummy round comes up, all you'll hear is the click of your hammer falling and you'll see exactly what your flinch is doing.
4) What helped me get better right away was to not so much as fight the urge to flinch, but rather let it happen a little bit later (i.e. after the bullet has left the barrel). This worked hand in hand with me closing my eyes for a brief second after I fired the gun, and led to dramatic improvements in my accuracy right away. Again, the idea was to allow my reaction to the gun going off, but just delay it by a little bit so that the bullet has left the barrel before the flinch could affect my aim.
Hope this helps and happy shooting!
I too bought my first commander this year and have fallen in love with it.