After reading and watching a few rwd drift tuning videos, i got my d4 going well enough altho i ve only been doing donuts in my garage (smooth concret) so far... stock wheels and tires. also tried some angled drift wheels i had.
I set my gyro up and it makes it all work, but for tuning i have limited my downtravel to zero with a ride height initially at 5mm. i drove it and tweaked the spring settings until i got a decent grip for my donuts and speed. using kit springs. the rear sags a bit how i ended up with my spring settings.
My front shocks are strait up i believe on the outer most hole up top, and the back im 3 from the inside (diagnal).
i got the battery in the middle, and 23g weight ontop of the front bumper.
My gyro is mounted on the top deck near my servo.
and my servo is also reduced to 50% approx. one side is less than the other.
another user with 4wheel balance tool suggested close to 50/50 weight front/rear for smooth concrete surface for his best tune on his blog.