So MSD called me last week to inform me that they cannot duplicate my issue w/ this box. They said they ran it on a "hot box" at 4k rpm for 8 hours and it did fine. I said yep b/c it's fine up until 4500 rpm.
Then he said they put it in the freezer overnight and back on the "hot box" the next day for 8 more hours at 6k rpm w/ no problem.
He said the "hot box" brings the temp up to engine temp. He explained no further.
I said this is interesting b/c I'm confident it's in the box and even one of their tech guys agreed w/ me a few weeks ago when I called to get the RMA number.
He said that's all they can do.