can not figure out the problem. nitrogen deficiency/lockout/root bound

Hey guys/gals sorry to flood up the forum. But I've got an issue i cannot resolve. So here goes;
2 papaya plants by Nirvana seeds. Both in soil, 5 gal buckets, 600 watt h.p.s. in a well ventilated secret Jardin grow tent. Week 6 of flower newt reg is, Fox Farms tiger bloom, F.F. liquid plant food, (earth worm castings) CalMag, and bud candy. It appears to be a nitrogen def. I've p.h.'d my soil run off to 6.5 both plants are exactly the same, yet only 1 suffers the issue. I upped the newt when i fed them yesterday, but i dont know if its had any effect.
Here are the pics. If i forgot anything or you need to ask please do. Thank you all in advance for any help. Namaste.

you are fine. This late into the flowering they will start to yellow as you dont have very much N going in. Being that you are giving them 2-8-4 your N is low now compared to Veg.

From what ive read yellowing around week 6-7 is fine. its nearing its end of the cycle. Now i have 4 plants going and using FF Tigerbloom and Botanicare calmag and i have no yellowing yet but i also switch to TB at week 5 from a high N bloom from Botanicare. Mine seem to be slowly starting to yellow.

The really low ones i wouldnt worry about. mine has been slowly yellowing and falling off due to low light down low and sending all the food up top.

You are looking good so far my man!

First and foremost, thank you for the advice and reply. Always appreciate knowledge. Normally I'd agree. The reason it has me so. worried is the other plant is same strain same regimen everything. The second girl. Has a small amount of yellowing on older fan leaves. As would be expected. However the plant with the issue, is turning extremely fast. Its happening on new growth as well as old. Right up to the top cola. Where the other plants pistils are turning a vibrant orange, the other seems to have stopped development altogether. Or its just the pheno difference. I'm by no means a pro.this is like grow 4 or 5 never had this happen. Ill keep on keeping on and hope she is ok. Its the lack of development and amount of yellowing that seems off. I was wondering if i may be root bound.... Again thanks a million.

No problem! Im no expert as well.

if you have other plants that dont seem to be giving off the same traits it could be pheno as you said, or something else. I just read alot about yellowing around week 6 or so.

If it does seem to have stopped any growth then i would chalk it up to something wrong, but i dont think it could be rootbound in a 5 gal. i have 1.5gals and 3gals going with no problem and they are pushing 40" tall.