man i use the same stuff. There is no reason to be mixing it at 1/4 strength. I know that sometimes you wana go ½ or ¼ strength but, this is only for nutes that are for tomatoes or other plants. Advanced nutrients is made for cannabis so the levels they tell you are for cannabis. Unlike miracle grow which is for a very large variety of plants.

I would go full strength, but you might want to slowly raise the concentration over a week or something