check this site out.
Official A Sweet Seat Website
i have a good friend that has lower back problems and he had his seat done here. he could not ride more than 300 miles a day on his road king. he said he now does 600 plus miles no problem.
i had my mustang seat for my Vrod road rod conversion done and it made a big difference. my wife use to get those lower back jabs when ever we hit the raised ribs or frost swells. if it happened early in the ride she was uncomfortable the rest of the trip. Now we don't even feel the bumps. my ass still gets that feeling after you sit to long but a little repositioning and good to keep going. the big benefit is we don't get those bone jarring hits to the lower back.
the guy use to make special seats for handicapped people and is now pretty much into motorcycles using a special memory foam.
He will tailor the seat to your needs. the nice benefit is the memory foam when it gets warmed from your body heat conforms to your butt and can also lower you about an inch. Give him a call nice guy and likes to talk. He might be your answer.
Dennis