Well, that wasn't from one tightening. That's the result of many years of use.
Now that I've driven the car something like 75-100 miles since those new tires were installed, I'll give the knock-offs a little more encouragement to stay put. Then they should be good for the duration.
By the way, in my lifetime of driving cars with spline-drive wheels, I've had two come off while driving. Fortunately neither incident was at enough speed to result in serious damage (one destroyed a fender, but that's all), but I have never had a problem with wheels being tightened too much.