Dont go to crazy on things u read on the internet focus on thing u want from it.

How does it drift for ur style?
Can u drift yet?
are u high speed drifting or slow speed.
Do u need more rotation
do u need more front grip

Locked rear diff and maby 50g weight up front should be all u need

Eaysest way to lok a ball diff is dissamble it, cut 2 peices of cardboard the exact same size as the thrust washer. reassemble with the cardboard between the balls and the washer. simple fix and easy to undo