Turn your seat upside down. Pull the staples and break the seal. Peel the seat cover back. Use a bread knife for whatever works. Cut about 2" out of the seat. Get memory foam. Cut 1" slices and spray glue them in building from the spine area forward making a pocket. Cover the missing 2" with the memory foam gluing it in like a puzzle. Leave a bit of thickness out where your legs drop down to the side of tank. Put it on the bike without the cover, sit. Does it feel good. Build up spots that don't feel right. Cut down spots that feel high.
Pull the cover back over the seat. Spray glue and staple.
You are done.
