You seem very hung up on this muzzle flip thing.
Once you build your muscle memory, you are back down on the target in
fractions of a second. That is the big difference between guys who
like slow fire at 25-50 yards and guys who do rapid fire strings at 7
or less.
Lately the only thing I have been doing is "extend and fire" a double
tap from the retention position with the gun starting in D/A.
That gets me used to both trigger pulls and creates the muscle memory
for an instinctive shot in bad light. It also reinforces taking your
finger from "safe" (along the slide) to being on the trigger ... and
back.
Most target shooters I see pick up the gun with their finger in the
guard! I assume they do the same thing when they hear a bump in the
night.
I have to admit, I did it too before guys like Ayoob started teaching
the finger along the frame thing.
I was taught finger along the frame by the CCW instructor over in
Virgina. Never developed the habit of keeping a finger in the guard. Too
dangerous, especially with the CZ competition pistol I had.
I have a friend with a .454 casul and a short barrel. Muzzle flip and
slow cycling are issues. He says decent ammo for it is about a buck and
a half to two bucks a round. No thanks.