Depends on how much P/K you already give...
more is not always better.
this is easier to give numbers for soilless/hydro contexts. Feeding over 190ppm K is very unlikely to have any positive effect on yield or potency. With P i've seen studies peg this at 30-40ppm, but 50-60 is more than safe and limts waste.
those numbers won't translate well to soil, but gives an idea that it is about a happy zone, not gassing the shit out of it.
if you already give lots of p and k, you will only cause a p or k toxicity or needless waste of p/k in your runoff by adding more.