Yeah, even my 19-inch on the Touring gets warm in the summertime. Indispensable for long rides, but in the summer for shorter jaunts I need a cut-down version. Going full naked on a cruiser where you lean back also sucks, you're like a massive sail in the wind, it's exhausting.
The "pounding" one takes with an intermediary shield is really the worst of it. You don't get protection, but you do get all the swirling wind from the top of the shield hitting right at the helmet and pummeling it left and right. That gets even worse if you have a helmet that isn't properly snug (almost all riders have too large helmets, statistically speaking).
What bothers me the most really is that ventilation through the helmet suffers when the helmet is not out there in the "wind stream". Mine ventilates like nobody's business without the shield on, but with it on it's iffier.
On a previous bike I actually had a lot of success with cutting the shield way down. The air hit about just under the chin, so the body was offloaded, but the helmet was in the wind. It was a bit more tiring than a full shield, but so much more bearable in the summertime.