Weeks to go ...
Pistils will color off as the hit maturity ( I barely see any of that )
Flower will swell and harden off.
Scope buds not sugar leaf or fans.
Let them finish when they finish ... not according to breeder estimates or counting weeks.
Plants often go past breeder times.
Keep flushing to Taco Tuesday .... It does nothing .... NOTHING to plant. It only “ leaches “ the medium ( soil ) . Unless you are dumping heavy synth feeds on it , flushing would be done to cut the salt buildup ... That’s it , to keep the buildup from causing uptake issues. If keep feeds under control and “ as needed “ then you would never have to flush.
This is why some growers overfeed and get claw , shiny dark leaf , slowed growth , stunting , irregular growth , burns , etc. ( too much to acclimate ) , and the problems become the “ the growers fault “ .
After week 6 nitro use drops down since plant is not making new leaf and branching , but is still a vital element for photosynthesis.
Flower building is front and center .... your plants look quite good and I would stick with what you doing.
Keep on keeping on ... patience grasshopper patience.