I think I'm one of the few here who doesn't get too bothered by the stock seat.
I've done several weekend/1000mile + rides as well as many 300mile single day rides and never had too much of a problem.
Sure, sitting for extended periods gets to me, but no more so than if I were to be sitting in my Jeep for the same time.
But then again, I got into motorcycling on dirtbikes, so getting used to the even more uncomfortable feeling of a dirtbike seat kinda got me thinking the stock Vulcan seat is actually comfortable compared to a dirtbike seat.
Have you considered a seat cushion? AirHawk is often brought up here.
AKA: Tim & 'The Adventure Cycle' VROC #24567, NEVROC, SteelCity VROC
"When life throws you curves,
Aim for the apex."