I dont think you should flush earlier... Imo i flush for about the last week for 2 usually ive pushed em an extra week just to do this..
I feel that itd be better to give them the nutes as they need them then flush it after the buds are developed and ripening.
The way the guy at the hydro shop explained it was
The plants use different nutes at different times in the grow.
So makin sure you have enough nutes when the plant needs them is just as important as which nutes you give them.
For instance nitrogen in the flowering cycle. Usually by the time flowering is started we back off on nitrogen because it no longer needs as much
And start giving increased amounts of nPK.
this is why i let the plant flower for the entire time the breeder suggests add a week or 2 to their estimate and use it to flush.
This way i know the plant has "finished" it's flowering cycle and used up any nutients left over.
At tht point im just checking for my desired results
Just my .02
Plants looking good by the way i told you theyd bulk up!