Heat sink not flat

I bought a new Jive 100 LV about a week ago. It's in my Trex 550 and working fine. I noticed that the metal plate used as the heat sink is not flat and there was a thin ridge all way around. Most likely these pieces are stamped out of flat stock and the punch must have been getting dull to leave a sharp ridge. I was able to remove the ridge easily enough. But when I put a steel rule across the plate it's obvious that the plate is dished inward towards the center. I was thinking about returning the ESC but thought another one would probably be the same way so I didn't bother.

I have the ESC mounted to a flat aluminum plate that I made to act as a heat sink. I know for the best heat transference both pieces need to be flat. The only way for me to correct this would to be to sand down the plate till it is flat. This would involve sanding a bit of the ESC's case as well. Not that I think it would hurt anything.

For now I think that I'll let it go. The PA (fet) temps only registered 30 dregree's celsius (85f) today but ambient temps were only 7 degree's celsius (45f). As summer approaches I'll keep an eye on the temps and see how they run.

I am a little disapointed in the quality control aspect of this. Now it just dawned on me... If the plate isn't flat (dished in) on the outside, how will this effect how the plate is making contact with the fets on the inside? Gee... maybe I should have sent it back.

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