As previously expressed, bend the rear locating lugs to drop the rear of the riders section of the seat. This should always be the first step in trying to make the OEM seat more tolerable. I found the custom sheepskin feels fantastic, but realistically, only extended the riding time by 15 minutes or so. It wasn't the solution on it's own. Unfortunately, I had the OEM reshaped before i learnt about the above 'trick'. Even reshaping didn't solve it for me. I now use an Airhawk, which once again isn't perfect, but I can pretty much stay on it all day. I would prefer a comfy seat without the Airhawk but for now it is extending my 'comfortable' riding time.
Cheers.
Skip.