Fox Farms Ocean Forrest, Start to finish with no nutes

HI, i have been reading where you can grow start to finish with ffof with no nutes , especially if you up pot the container to a bigger container with fresh soil when you flip to 12 12?,, is this possible?
I did this and everything was fine up till week 4, flower,, then I started adding 1/4 strenght nutes and now I am getting tip burn and nitrogen toxicity,, on very low nute strenght, so my thinking is the soil is still hot enough from the transplant
any thoughts?
thanks

at the 4 week point, you should have fed the soil, not the plant, look into brewing organic teas