TESTED: Mid vs Rear ESC Position | Heavy vs Light Battery

A few things I have been curious about:
the whole "move all of the weight to the rear" craze that is going on with RWD RC drift recently - how much does moving weight towards the rear really change acceleration?
how much impact is there by using a heavier or lighter battery?
I had some time, and a way to move weight to the rear of the car for free $$! So, why not test it!?!?
Here I show you how we tested it and what the results were.
What do you think?
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