MM210 - settings 1/8 vs 3/16ths

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So the Millermatic chart for mild steel using 75/25 gas with .030 wire says:1/8th -   3/503/16th -  3/52I understand that the charts are correct, and a good starting point.  But can someone explain to me how moving the wire speed up an increment of only 2 can do a 50% thicker peice of steel?     Does this very small change in wire speed imply that you'd need move the torch much slower when doing 3/16th work to get adequate penetration?
Reply:Here´s a chart that shows more less the amps you´re putting in a weld...As you can see it almost goes exponentially if you´re increasing wire speed.Not a single number in your machine would be a lot of wirespeed increment, or maybe not...But yeah, that´s a rough estimate... Attached ImagesMy Babies: HF Drill pressHF Pipe Bender3   4.5" Black and Decker angle grindersLincoln Electric PROMIG 175that´s it!
Reply:I understand the graphs and realize that increased wirespeed provides more amps.   But my question is only about the very small increase in wire speed to accomodate a 50% increase in thickness.
Reply:Originally Posted by guilowSo the Millermatic chart for mild steel using 75/25 gas with .030 wire says:1/8th -   3/503/16th -  3/52I understand that the charts are correct, and a good starting point.  But can someone explain to me how moving the wire speed up an increment of only 2 can do a 50% thicker peice of steel?     Does this very small change in wire speed imply that you'd need move the torch much slower when doing 3/16th work to get adequate penetration?
Reply:I always run mine on the next setting up anyway. I run 3/16 on the 1/4 setting for ex. The 1/8 seems to do just fine, IMO. It does seem a little silly, but sometimes it makes a difference. Find a spot you feel is better and run it there. Those suggestions on the chart are a bit conservative sometimes.