Your seat looks good!
We're doing something similar with my wife's seat. We had this guy work on it and he messed it all up, so we bought a used seat from a junkyard to use while we redid the original seat. We got some gel from Kno Place along with some memory foam. I shaved the stock part down like yours, a more steep angle, and still need to cut out the depth for the gel and memory foam. The gel pad is going to wrap around the sides of the seat where her legs sit, and go up the back part of the seat. I got some sheet metal which we'll use to extend the seat on the back, and have a tab for bolting it down to the fender. We're having another guy fab up some new fender brackets for us to eliminate the upward swoop part where the backrest/sissybar on the stock seat is. We're going to relocate the tail lights back some with the new rails.