You just changed multiple things altitude and temperature. As altitude increases air density decreases. Reduce the temperature and air density increases. In your example you got the 1.5” difference because of the two variables having similar air densities means similar amounts of drag. Run the same calculation at 90 degrees for both (ignore differences humidity, barometric pressure, wind direction & speed) I’d bet your difference is closer to 4.5” at 500 than 1.5”.For the VAST majority of hunters the Leupold CDS system is simple and effective for any situation they will find themselves in.
For example, on my .300 WM 165 gr Federal TBT with a 200 yard zero:
Sea level and 90 degrees F, 6.3 inch drop .
7500 Ft and 20 degrees F 6.1 inch drop.
Sea level and 90 degrees F, 36.8 inch drop.
7500 Ft and 20 degrees F, 35.3 inch drop.
A difference of a quarter inch at 300, 1.5 at 500.
I get my turrets cut at 4000 ft and 40 degrees. Works great for any hunting situation I will ever find myself in.
I have decades of experience dialing in scopes calibrated in MILS, and some in MOAs. The CDS system is easier and faster which can be very important in hunting situations. Nothing is quicker and easier than ranging, then matching the number on the dial which is what you do with the CDS turret.
Are you running your calculations off your rifles chronographed MV or the boxes published MV?