Welcome from sunny and warm North Texas. You should spend a little time to set the suspension properly. That will improve comfort a whole lot. Set static sag at about 1/2 inch and get some preload adjusting caps to dial up the front preload if necessary. Also change the fork oil ASAP since that has likely been neglected. That should sort the comfort out. I did my Iron Butt qualifier on my 05 Standard after getting the suspension right and adding some touring features (footboards, Utopia backrest, classic bars, windshield, throttlemeister, etc). The bike is built to ride all day, you just need to dial in what works best for you.