A copper core radiator transfers heat 35% better than an aluminum radiator. I had a 3 row recore years ago and it stays cool even hauling my Jetskiis to the Colorado river across the socal desert running the A/C.
if copper transfered heat 80% better than aluminum, makes no difference. Aluminium radiators get the job done
500hp street honda civics do fine with their "half-sized" aluminium radiator. Find the overheating culprit