you mean the amount of FASI that you add to the limo? yeah I guess you can do that.. but to be honest, its no need to be exact about these things. The important thing is that you add the FASI until the limo stops clouding, wait at least a couple of days for precipitation, retrieve the crystals (or goo, depends sometimes..), and add more FASI again to see if it gets cloudy again. Then let this limo+fasi stand for a week or so on this second 'run', otherwise you might lose some actives that didnt crash out yet
with the crystals/goo, you can redissolve them in water and evap again or recrystalize with minimal amount of hot IPA to help getting rid of any limo traces
good luck and tell us how it went!