Edelbrock Experts I need your thoughts

I've been playing around with an Edelbrock 1406 on my car. Im curious about the jets and rods sizing. I've been playing around with different combos for my car, just to try to understand how these work together. Which got me to thinking.

Stock main jets are .098 and 75/47 Rods. Which is 23/51 (Im getting this by subtracting the metering rod sizes from the jet size). Which is the actual orifice opening either at cruise or power. Correct?

I went to .092 and 68/42. Which is 24/50

Now in my mind this is a very similar combo if I understand this correctly. So my question is since they are almost identical does it matter if my main jet is larger or smaller? Either way I get almost the same A/F readings. Does this make sense? Its kind of hard to explain by typing.

My other question is... Is it normal for Edelbrocks to lean out as you roll into the throttle? For instance say Im driving at 60mph and my A/F is 14.2-14.7. I roll into the throttle fairly heavy but not enough to get into the power side. My A/F will creep up to as high as 16.7 depending on how hard Im pushing on the throttle. Just wondering if this is a common thing.