Way, way too much potassium. Something more like NPK 4-8-12 or 2-4-6 would be better suited or buy dedicated cannabis flowering nutrients.
If you are in OZ, Flair Form and/or Ozi Magic put out good products that you should be able to get out west easily enough.
Maxicrop made by Multicrop works well, (used it for years) and is nicely balanced, if you don't want to go to a hydro shop or wait for EBay, and is available in most super markets or general gardening/hardware shops.
Hope this helps,.... Organoman.