It's mid-week 5 of flower in the grow. I did a late "lollipopping" (Clearing 20% of bottom growth, to give the top more energy to produce bigger buds) to give more valuable energy to the top of the plants.
I think the reason my big plants are going yellow one week early is because I left the bottoms of the big plants. I should have removed them earlier. It's nice to be able to experiment, but some things like lolipopping and flushing are a must. You live you learn.