Help with weird yellowing PIC

This plant is about a week and a half into flower. Right before i took it out the veg room it was my strongest healthiest plant.She vegged under LEDs and CFLS. I run a 600 Hps in my flower room. The discoloration is only on the top half of the plant all the lower leaves appear fine. I thought light stress so i moved it up but to no avail. I fed her FF big bloom, tiger bloom, open seasame and some purple max last week. so she just got plenty of nutes and the color did not get better. I stay to a strict feed scheduale of water food water food water food ect. and im growing in FF ocean forest. Can anybody give me any advice? Thanks RIO.

It's probably either the soil Ph or you have a deficiency. If the latter, it looks like Nitrogen and Magnesium def. Check the soil Ph first.