RE: Long way to go to keep both eyes open...
I am right handed and left eye dominant like many others.
I use this to my benefit. I can shoot equally well left handed or right handed - great for messing with my left handed bow shooting friends.
Also, in the Army I consistently shot 40 out of 40...
I used both eyes open, scanned with my left and shot with my right. Might be something you want to practice.