Chris,
You may want to look for a more modern radiator, and that would be helpful with overall cooling, but if I was betting on the overheating at high speeds, I’d put my money on it being a lower radiator hose problem. Wait until you check it out before making any decisions about the radiator itself. Those old stock radiators aren’t the cause of as many of Tiger owners overheating problems as they’re faulted for ——–read the Tech Tips article closely. Best to solve problems by changing one variable at a time.