Install the under bumpers plates - and approach all questionable curbs at an angle and you should be in great shape.
At the end of the day - I would fix the funky lip.
This! I have the "rolling" curb (seems we all do in Arizona). My CS has to go up/down from the driveway to the street at about, oh 0.0005 MPH and at a 45 degree angle. And then I'm still glad I have the under-bumper plates. Those are a must.
Also, if you have the same sort of "rolling curb" (not sure what else to call it) then there is a thingy for sale on the web that goes along the curb/street and smoothes it out. I didn't get that because the slow/angle technique works, but you can always go that route if needed.
Finally, fwiw, I doubt seeing the specs will really answer the question. It really depends upon the individual curb and the car and (believe it or not) the weight of the driver and whether there is a passenger in the car when going up/down the curb!