Does This Debunk the "Coolant Can Flow Through the Radiator Too Fast" Idea???

I tried this experiment back in about 87/88. Had a 75 fury 318. The heat gauge was always just past 1/2. That bugged me all to hell. It had a 195 t stat. So I changed the t stat to 160. It was good in town. But on the highway the gauge would go way past 3/4s in about 40 miles. It just kept inching up. Next up was a 180 t stat. Good in town, inched up to 3/4 on the gauge. On these two stats the farther I drove it the hotter it got. Put the used 195 back in. No problem at all. This had a 7 blade fixed fan. So now I run the 195 in all my mopars. Even my race car. Your results may very. Kim