I dont jack about guns, hell i just traded my Sig p238 cause it was a SAO!! Got a nice p232 to replace it so im happy.
trainning with your weak hand is a awesome idea. I need to do some that.
But IMHO, I never use a dominate eye or what not. I was trained to never use the rear sights at all. I use both eyes, wide open, parallel with the top of the gun. I shoot what's in front of me.