I've owned countless cars with such a wheel set up and aside from one VERY hard hit where I ran over a piece of timber, I never experienced such things. I was also part of a certain Porsche forum where most cars have 20in wheels with a lick of rubber and you would be hard pressed to find posts talking about buckled wheels.
Do you know who makes these wheels? If so, perhaps do a few google searches to see if this a common thing for this particular manufacture of wheels.
Bar that, perhaps the chassis is doing it's job of isolating you from fully feeling what could have been a harder hit than you realised.
Good luck...
