I've heard other reports that are the same as yours. Don't wind them out to redline and just ride them normally and the heat is a non-issue. I don't have that many miles on mine so have been taking it easy. I've had no issues at all. I took about a 150 mile ride on Sunday morning. It wasn't very hot outside but several times I reached down to feel the heat on the left side (where I have heard the complaints) and compared it to the right side and just couldn't feel any difference at all. I think you may be right. Longhaul Paul has over 50,000 miles on his '18 now and reports the same thing. He said that he has actually ridden about 10 or 12 of these bikes and only one time, at a demo day, he felt excessive heat. He talked to the Yamaha who told him he was riding it wrong and shouldn't wind it out like he was. He tried it that way and had no heat issues. It may be a learning curve for those of us coming off the V4 which loved the higher RPMS. After owning a Harley for a couple of years, it was an easy transition for me.