Tell me about it!
I used to have a Sportster, great on twisties, it is ok for long ride but you will feel it after 150 miles, find yourself a better seat, it will help a little at least. I have ridden 300 miles day trip without a problem except my lower back and rear end lol.
Get a good seat and depending on your handlebars you may want to find what feels comfortable to you. A break after every hour helps alot. We ride two-up 300 plus quite often.
Mustang wide solo,apes pulled back,forwad controls,windshield, actually more room than my EG.The only difference is that even with the windshield I get hit by wind more than my EG.But the Sport is a long distance runner.
Also must add that the Sport kicked butt on three some kind of Metric cruisers last night and the old girl is stock except for a 3/4 inch hole in each baffle.