Alot of this can also be dependant on track/setup though.
Running on a multi surface i put 30g upfront, nothing on the rear. I found moving more weight to the rear made the back end want to continue rotating making it spin out more.
Driving style also is a dependant so for some adding weight here or there may not work for them, others it will.
I would try out what suits you/track & setup in this case by changing bits about as you have been
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