warped brake roters

just to clarify; this will be the third set of rotors from new.
I fitted the last set myself; with new pads.
i torqued the wheels of properly. Not using an air gun.
This style of van' went out of production a long time ago
oem parts are difficult to find and very expensive.
The rotors were not worn and the pads were still good.
When the brakes cooled down; the brake shudder was not so bad but it came back again under heavy braking
anyway I've bought new brake rotors; Chinese and new brake pads Chinese the only thing I could find made in the US was the grease for the wheel bearings
it's sad isn't it
I'm rebuilding the brakes carefully and checking the steering components out for wear. But I have found nothing obvious
apparently no one thinks that the flying saucer wheel trim covers may have contributed to the overheating problem. The wife will be pleased because she's loves them.
When I have finished the front brakes I may check the back ones out if I have time before I go to Florida
thanks for the input guys