Last weeks of flowering, tips to optimise yield?

So i got 4 plants at 7weeks of flowering under a 600w hps in a cooltube.

They are grapefruit and blue hash and all are estimated to be ready in 8weeks.

Medium is soil, gold label special mix and i feed them biobizz grow, bloom, bio heaven and top max at almost full strength every watering now.

Im gonna start give them molasess the last weeks but im thinking if i need to flush with water only from now or if i should keep feeding them a week more?

Biobizz chart says that i only need 1week of flushing and some people say i dont need to flush since its organic?

Im seing alot of bud growth now and wanna fatten em up as much as possible but i dont want em to taste crap from nutes.


Also the trichs are still white but i sampled a small nug and it was dank but harch.
 
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