I have sent a couple dozen knives to 24 members in the last couple months after I switched to an
18 degree setting on my Edge Pro for final sharpening bevel.
I was doing mostly 21 degrees before.
Most were M4 and a couple other steels.

What is the report on the 18 degree edge??????
Works for you? Would be better if......... Or ?.......

I have not used that angle in field yet, but it sure cuts me easily.
Seems to do good on the whittling of beech and edge holding I have done.
I do not see a reason to use a more narrow angle, but a steeper angle seems better on some blades.

???????
Tim

"The significant problems we face cannot be solved at the same level of thinking we were at when we created them."
Albert Einstein

At Khe Sanh a sign read "For those who fight for it, life has a flavor the protected never knew".