5 week flower what's the problem??

Hi RIU girls & guys this is my first grow so unsure and need help with this please, i posted about this a couple of days ago and the response i got was not too worry its normal for the plant to be yellowing ive done a little research on it and now i just want others opinions to put my mind at ease , well im at 5 week flowering today and in the last week some of the leaves are yellowing and getting brown spots in places i understand the leaves will yellow as the plant nears to the end of it's cycle but im only 5 week in and most people ive seen grow Big Buddha Blue Cheese they go between 65 - 70 days till harvest so im just half way so shouldn't they still be green here's a few details of the grow ,

And when i switched to 12/12 i didn't carry on feeding Grow Nutes could this be the problem as it didnt get as much N?

THROWN IN SOME BUD PORN ALSO YOUR WELCOME

Strain - Big Buddha Blue Cheese
Lights - x2 600w HID
Temps - 75 - 79F Light's out Temp - 62 - 63F
Humidity - 43 - 47%
Airflow - Plenty running through tops of plants
Nutes - Ionic GROW/BLOOM/BOOST feeding at full strength
PH - 6.3
EC - 1.4

Just keep doing what you've been doing and everything will be okay. If you had 4 of these and were planning to run her full time I would increase the nutes on a couple of them to see what she can take and get dialed in for future grows. You would also know that she can take a little more nutes going into flowering on next grow. But with just one, I would not push for the red line. Know that she is going to look like shit before it is over and your smoke will be super smooth and delicious. Good trade off but always sad to see your beauty decline in late stages.

hey bugeye thanks man so just up the nutes on next feed ? should i add a little grow nutes with bloom? and ive got 8 plants but this one is the worst one thanks for the reply man

Like I said, if you are going to run her full time and want to learn her tolerances and can afford to mess her up in the name of science, go ahead and up the nutes. Otherwise, keep her where she is at. I grow different strains every time so I would rather error on the side of fading just a little too early and having awesome smoke. When I see a plant fading a little too early, I might toss down a little 5-5-5 just to maintain, not to try and bring back green to fan leaves that are destined to die early anyway.

I've moved into organic growing with AACT so thankfully I don't have to make those hard decisions anymore!