When I got a Corbin seat on the 650, vibes to the butt increased as it is a much firmer seat. The Airhawk R worked wonders at removing the vibes for me. Not sure your definition of bigger, but I'm around 200 lbs.after discovering how much my teeth can buzz while riding my new toy... I'm going to have to look at either a seat or a pad.
Are the Airhawk's enough to take the vibes out for bigger riders?