Here’s my 2 cents:
I am 206 pounds and pulled (or broke) ribs on the left side of my body and then 6 weeks later I pulled (or broke) the right! All this at IMI! I have a Ribtech with a finger of slop when I sit in the seat and a nice vest. My problem I think is my upper body weight above the seat.
Here is what i did this winter and I haven’t had a problem since (and my wife thanks me for not grunting when i roll over in bed 😆 ) I took my rib vest to the glass store and they cut 1/8″ lexan strips (better than plexiglass) and sewed it to the outside of the rib vest. Haven’t had a problem since, even at Bandibumps. Holler when you’re at the track and I’ll show you. I am in seventh heaven now!