Yellowing from the center

i have 6 plants.
3 are healthy. the other 3 have a problem.
I just entered flowering stage 2 weeks ago.

All new growth yellows from the center, meaning the edges are green and the center is pale yellow and greens as it fades to the edge.
I have done leaching to help flush out plants.
2 got better but still have some mottling.
I thought it was a zinc or iron def. but the micro nutrients i fed them with those zinc and iron in it, did no help.
Some one told me it was nitrogen so i went back to my grow nutrient with more nitrogen and that did not seem to help.
The ph is around 6.5
I use botincare pro bloom. superthrive and 250 HPS. the temp is around 80.

I cannot figure out what is wrong with the one plant that remains to do no better after all of this.
I have leached with over 3 times the pot size.

Does any one know what i can do?

I'm not a nutrient deficiency expert by any means, but a nitrogen deficiency is usually seen in the older leaves turning yellow between the veins whereas leaf tissue close to veins stay green.

You might be able to use this decision tree to figure it out. As a tip, the first decision you should make is that your plant is a dicot (unless you're growing corn ).

I hope it helps!

Thanks i tried using it but did not have much luck. So I took some pictures. Please help me out i have no idea what to do with this plant.

pics are poor
google mj plant abuse
2nd from the top
see if you ca find a match

i have already done that, any other takers?