I am in the same boat, I was thinking about trying to trim my stock seat myself. I am 6'8", 300 lb bandit rider who took a beating last weekend riding 240 miles on a stock seat. Legs and arms were fine, but my @$$ was hurt'in.
Corbins are nice, but if I am going to spend the money, I would like to get a seat that was fit to my unusual frame. That is, I would like to have the pilot seat raised an inch or so and slid back about an inch.
Anyway, I found some good sites online that will reshape your stock seat based on your weight, height, inseam etc, but they are expensive! So before spending the $$ I was going to try to do it myself and see how it works.
Please, let me know if you have success, I will do the same!