I sometimes notice some white smoke from the rear view of mine as well. Only a wisp and only at WOT.
It really shows up if the sun is shining from behind the car.
I believe that I have noticed the WOT smoke since the first time or two that I got on it.
No oil or coolant is getting gone at 5K miles, and the performance is super. So I believe that it is inconsequential.
I suspect that it has something to do with turbo charging and the large amount of fuel that must be getting injected at WOT.
"Where there is smoke there is fire"
So if there is a lot of fire there may be some smoke?
Good luck.
Rickey.