No numbers on the bottle apart from the nutrient percentages, pH (5,6) and ratio (which is as you stated 0-1-3). And yes your right, monopotassium phosphate and potassium sulfate, is this not as good as other nutrients? I bought it because I heard good things but I'm no expert.If you are only feeding it is 0-1-3, during bloom, that might do it.
My memory is that big bud is mostly monopotassium phosphate, and potassium sulphate.
Do you have DLI or ppfd numbers?
Cheers for the help