In my opinion, that 0/50/30 might be good for tulips, but I would not use it for cannabis, it is far too excessive in its phosphorous and potassium. These extreme nutrients usually have a bad effect on taste/flavour, producing a horrible metallic flavour. If your flowers are already growing fine with what it is that you are using, I would recommend sticking with that, rather than risk using a fertilizer that is not really intended for plants that will be consumed. Most cannabis P/K boosters that are of "normal strength are around 0/12/13,, or even much less, so I personally can not recommend using anything with extreme levels of P AND K. Others might, but I would suggest not. I don't think the risk of ruining your, so far, well kept flowers is worth finding out the hard way. I have tried these sort of products when I was a lot, lot younger and learned my lesson the hard way - big blooms with diminished trichomes and with a horrible taste.
Hope this helps,.... Organoman.