Yeah I've read a little about the dark time at the end , I'll need to delve deep into all this in the morning, I do think I will flush , maybe even for just a few days towards the end as the last thing I want it chemical tasting bud !
needs more time ( grow time ) …. You are hyper focused on “ time table “ …. Plants do not give a shit about calendars or time “ estimates “.
Plant will finish when it finishes. There are still white pistil growth. As stated , since you are pushing runoff , you are technically already leaching the soil.
Feed them as they are still blooming , get more weight , more mature flowers.
Also …. If you were feeding without excess - flushing is not needed.
It seems not too hard to clone a plant and treat each clone differently and see what the results yield for yourself. You will see real quick if flushing is for you or not.