If it's still getting hot at speed it could be something else. The clutch fan only helps till 30-40 mph. Another thing you might check is a dirty radiator and size also. Stock is 1 1/2" thick at the core ( I have been told by 1 person) mine is 1 1/4" thick and my yellow one is only 1" thick. That's BIG difference ! I'm almost afraid to run my yellow one with 30% less of a radiator knowing these VX's

From a recent discussion since you said above you replaced the radiator.