The issue is not that of the ride quality of the mower so much as the ground quality of your property. There are reasons why only a few companies have bothered trying to "improve" the ride quality of their mowers; the cost doesn't justify the potential gains is profits/market share and quite frankly it's a feature that most consumer's don't need. While something like suspension, or a taller sidewall on the tires might have made a significant difference in your own personal experience it is likely that inclusion of "ride quality" on the Consumer's Report might have either made no difference in your mower selection, or possibly made a less desirable piece of equipment (for other reasons) end up in your garage. If you have searched through this site or others like it I am sure you will find many suggestions and recommendations for end users with your type of landscape/property, but I am assuming from your post that I did your research after the fact?
It really is unfortunate because I have also been a victim of a somewhat similar situation. In 2018 I went to purchase a new vehicle. I was extremely concerned with safety ratings and got on the track of a car maker that touted having "state of the art" safety tech in their car. Working in the safety profession I was immediately drawn to this make of vehicle. WORST DECISION I EVER MADE!! The safety tech in that vehicle was so intrusive and in my opinion potentially dangerous for some drivers. My resolution was to sell the car at a significant loss and purchase something else. I did my research on this car and not once did I read a review where someone said that they had the pre-collision brakes activate them unexpectedly but it happened to me TWICE in just one month of ownership. If someone asks me what I think of that car, I will just tell them my thoughts, but I won't go to the extent of asking others to try and change the model of car reviews just for the sake of my personal experience.
With that being said, you have learned your lesson; Do more research and test drive your equipment, on your property. I hope that you can find a different machine to do what you need it to without hurting that back of yours!