I have a Mini Z Honda 24/52 that I bought 2 years ago. It is used to mow approx. 5+ acres of my own residence in upper Bucks County, PA. The ground is extremely bumpy, so when I purchased the machine I also installed Flex forks. Additionally, I installed a [spring] unit under the existing seat. Question: is the "Flex Seat" different from the "spring unit" referred to above? If so, please elaborate. Any additional dampening to the extremely rough/jarring ground would be welcomed.