My car was transformed with 150g added.
With no other adjustments other than 5 hole shocks, 35/40 oil and 150g, I went from 16 laps on average to 18 laps instantly !
But it's what you feel is right for you I guess. This is why I expect nobody has replied so far to this post, because everybody will say "no you want this".
There is no cut and dry answer. I think it's best to just go to your local club and ask around. You may even find a whole car ready to go ?
Good luck
