Heat is exactly what happens when you try to take 100 year old air cooled, pushrod, 45 degree v-twin technology, and bring it into today's EPA standards. 14.7:1 AFR is a laboratory perfect air/fuel ratio, in which there is exactly enough air to burn ALL the fuel. That's fine for the lab, and can be reasonable for an engine in which the temperature can be constantly controlled with water jackets, radiators, thermostats and fans. The injected Twinkies of today need more fuel to run reasonably cool, period, as well as the extra help I mentioned in the article. A good tuner can be your best friend, and if you find one, stick with him (or her)
It is a shame that we HD folks have to go this way, but love 'em or leave 'em. My S&S carb'ed Shovel sure don't run hot.
I'm sure it won't be long before Hd has to bite the bullet and v-rod motor everything, LOL