i heard a high P will make your buds swell up K is for foliage
this is a common mistake
it is more about ratios , you will find most foods increase both p and k, for flowering while maintaining the same or slightly less nitrogen
the two most used hydro foods in the uk, canna and vitalink, use 2-2-4 for canna, and 5-4.6-9.6 for vitalink, these are virtually the same ratio's of npk, its just vitalink is more concentrated than canna
if you round off the decimal vitalink values you will get 5-5-10
as you can see both canna and vitallink have the same ratio of n and p with 2x the value of k for flowering