Which seat modification are you going with?
I have removed the seat and shaved it down from the top using a sharp knife and sandpaper.
Also have purchased the Walmart gel cushion found in their automotive department ($19.95). Until I achieve what I really like, I simply "shave", recover with the original vinyl using duct tape underneath and go out riding for 30-60 minutes.
It is trial and error, but I am getting close to what feels comfortable to me. Last night I had the bike out for 1 1/2 hours, and only thought about my buns on the bike 2 or 3 times during the entire ride.
With the original seat, I kept thinking of nothing but my buns on the bike and my sliding into the tank ( which is very uncomfortable).
I've been playing with my seat on and off for about 3 weeks. Besides the weather has been Yucky, so riding has been very limited. I discovered that merely sitting on the bike is not a fair comparison. Even when I have felt comfortable sitting on the bike in my garage, when I took the bike riding, I did not feel comfortable.
But, what I had last night was good, I will try to improve it some by trimming the Walmart cushion. What I have is essentially the original seat cushion shaved and trimmed down quite a bit and using the Walmart cushion on top of the original foam. The Walmart cushion will require some trimming as well.