5th week flower - need help!! Overnute? Undernute?

Please help - I am just starting week 5 flower
FFOF soil - 7 gal pot
4x4 tent with Spider Farmer SF4000
PH 6.6 water in and out at 6.2
8/31 3/4 strength flower nutes - Medi-One 1 part plus additives per flower schedule
9/3 - PH adjusted plain water
9/7 - 3/4 strength flower nutes same as 8/31

THEN - I double backed and thought it was getting nute burnt so I flushed with ph water - about 3 gallons. Not too many leaves on her, so I didn't really want any more burning.

I don't have a TDS pen but now I am rethinking that it could be a deficiency?

First time grower and I have no idea what to do next. Obviously! Lol!
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OH - yeah - sour sister is the strain. I have no idea how long the strain is supposed to be but 5 weeks is way too early to start yellowing right?
 
Im no help but there are a lot of threads with FFOF that have plants just like yours,perhaps goggle FFOF rollitup.
 
Looks kinda like one of mine and thinking burned. If they are burned or out of balance from what I’m gathering a flush and low dose of balanced base nutes would be the solution. But I’m sure someone more experienced will chime in.
My bet is burned. But interested in what others have to say
 
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