Unfortunately, I've witnessed it to many times. I think ones best bet might be to look for smaller independently owned suppliers/ manufacturers as they have to pay attention to their sourcing quality and will suffer much more if they don't. IE: Howard's cams, Isky, Hughes, etc.
Hughes does not make cams. Thet buy them and resell. When the 1st started had Engle grind them. And it was Engle profiles My last 3 cams were Engle custom grinds. Just ordered a,Custom Ground Solid Flat Tappet.
just to clarify, I did not say Hughes made their own cams. My point was a smaller supplier like hughes is going to be real careful on choosing their supplier. I also wonder if it is the Cam or Lifter causing the issue years ago there were limited manufactureres on lifters. not sure if that's still true today
years ago there were limited manufactureres on lifters. not sure if that's still true today 
