The buds are done but i just fertilized

Heya thanks for taking your time to help me out - I'm a first time grower about to harvest and need advice. I got 6 plants in 5 gallon promix buckets under a 1000 watt. This morning i found some mold on a sensi star cola and two of the whiteberry buds. On both occasions the mold was from a leaf dying and curling back into the bud. I harvested the affected buds; luckily I only lost about 3 grams wet maybe. I got a bigger fan in there now.
On day 50 I fertilized with Tigerbloom and a pinch of 2-2-2 @ 400ppm or .8 EC. It's day 52 and the whiteberry all pretty much look done and the sensi star are not done.
Should I wait till the buckets are light before I start flushing? How much water should I flush with? How long should I flush?
If I wanna flush twice without overwatering I would say it would take at least 10 more days. I dont care if the buds are "overripe" but im afraid of more mold because some of the leafs are starting to die.

This is just a silly question:
During the final flush killing the bacteria and microbes in the soil and those bound to the roots would be beneficial since they provide nutrients to the plant. Should i still leave my water out overnight?
This pic is a good example of how done the plants are as a whole. Some leafs are a healthy green and some are purple, yellow and curling, dying and if not removed causing mold.

I had to chop some of the cola off this sensi star bush upfront due to mold but there wasnt too much lost. The one on the left is a different pheno S.S the other two are W.B. The one on the right will yield the most and has some buds and it's main cola supported by a phone charger cable that was nearby.

Yeah take ur time im not in a hurry. About to smog a fattie and I just heard about J. Cole checkout 'the warmup', dude is soo nice. Peace.

bump ......................

alright. i sort of bite. 1. are you going by trichomes to determine when to harvest? 2. check for dead leaves and that often. cut off any dead parts, normally i dont do this and just let them be till the whole leaf dies, but if youve got possible mold problems its a different story imo. 3. No, you want those microbacteria to thrive so they can help convert any unusable nutrients into easy to absorb forms. Thats one of the reasons to give mollasses, plus during the flush it does contain small amounts of nutrients itself, which helps the plant out as well. 4. I give 3 times as much water as soil 10-7 days before harvest, the last week is only water and mollasses, organics like fox farm dont require a longer flush imo.(some will probally disagree w/me but the only way for you to really decide is to try it out yourself and see what your opinion is). 5.In this case I would wait until they are dry again, put though 3x as much soil as water, i add a bit of mollasses the last bucket of water through the pot, wait till it dries again and repeat again, let it dry out again and then harvest.