Sorry, didn't mean to imply a ridgeline was necessary.
Hey, I was just playin', hopefully you caught the "smiley". Truth be told everyone is different and I'm just not that finicky. I used to be a motorcycle nut and one of the moto suspension companies had a saying "The best you've ridden is the best you know." I've never used a structural ridge so I literally don't know what I'm missing, but there is also "if it works, don't fix it." If I weren't comfortable or sleeping well, I'd try all sorts of things to make it work.