Knowing how much to feed was the most difficult thing for me in getting my corn Pangaea. I agree, there's a lot of variance online! The only thing I could ever find that definitively stated how much to feed was the Munson Plan, created by a user on this forum. You can search it in the forums. The only downside to this is many new snake owners (myself included) had no idea a weighing scale would be necessary. I finally broke down and purchased one, because it makes me feel a lot more secure in what I'm feeding.
A lot of experienced owners will feed by "common sense", but to be honest, in my novice, I don't have a lot of common sense regarding this area! That's why the Munson plan is great for me.
I did read something once online from a pretty detailed corn care guide that suggested moving to two pinkies once the snake can gobble one down with tremendous ease. After that, the care guide said to move to fuzzies once the snake is taking two pinkies with the same ease. In following the Munson Plan, I find that I was doing pretty much that.
I'm by no means as experienced as most on here, and have had my own first corn snake for three or four months.