have any of you used this system to increase your F.O.C?

i was looking at them and they come in weights from 10grs /50 grs that screw into back of alum insert.

if used, how would you know what weight to get or isgetting the point area as heavy as you can way to go .

i use 100 gr points on my 20 inch 2216.
i just put inside a 2020 shaft to stiffen the arrow and thisadded about 35 grs to point area,so i am up to around 435 grs on my arrows now.