Larger diameter wheels will roll over curbing easier, but with less sidewall and limitations on shocks, more energy will be transferred to the car itself. Furthermore, the cars being more pitch sensitive and ride height sensitive (they always were) means they’re likely going to be low and lack compliance.
So it’s a balancing act. Tunnel cars in other series have no problem using curbs.
I suspect a lot of issues are related to the wheel / tires / and suspension changes.