If you look at our state, 90% of the record book bucks come from the Mississippi River Alluvial Delta. It is beyond a shadow of a doubt in this state the biggest deer are produced on the best soil. They grow beans, rice, corn, and cotton there. They grow pine trees, honey locust, persimmon, and cedar in my area. That said, some of the folks in areas like mine are making a difference feeding protein. I have seen it make a difference on my place.You didn't mention how long those cards were out there. In the last two weeks, every buck on our cams has changed their pattern. Regardless, if inches are that important to you, I say keep moving west and north. 700 acres in Kentucky is probably worth at least 450 in MO. We have a neighbor that kills booners every year with a similar size property.
Seems like Native is in your state and clearly has deer that size or bigger, so I don't think it is just the soil. Maybe it is cover? Or maybe neighbors could all benefit from a pow wow to understand you're all looking for the same thing and willing to pass a few 125"s to get it?
What we have in my area is an abundance of cover, giving the deer a fighting chance to escape hunting pressure. Our g&f dept is fighting this, trying to make it easier and easier to kill the biggest deer. I fully expect in the near future for thermals to be legal
I never question soil fertility when I look at the pictures Native provides of his prairie. Also, I think that central area of the US has historically been easier on game. With changing climate patterns, than might not stay they same. We are used to 100 degree heat and two months without rain. It is a tough time for deer.
I think what you need to consistently produce big bucks - is two things - nutrition and age, or nutrition and genetics, or age and genetics. Bucks in my region average 115” according to g&f records. Yet, there are a fair number of 150” deer around because of age (cover). The more bucks you have of age, the more anomalies there will be.
Age is most important. I have proved in my area, with very mediocre average bucks, you can still scratch out a 150 every now and then - but we have quite a few make it to 5 yrs old.
Dawgs is not seeing his deer get age on them. Even with good nutrition and genetics, it is hard for a deer to make 150 at age three