Increase Potassium with Potassiumcitrat

High my friends,
My hydroponic grow is doing good atm but I want to improve some things.
Started bloom with an increased P Ratio (npk 1-3-2) and feeding 1-3-3 atm.
I want to aim for an increased potassiumconcentration at the end to get harder nugs but have no good fertilizer available in Germany. Jacks 321 would be nice but I can't get it here.
I have two nutrients avaible here NPK 6-17-15 or 5-10-9.
Both already contain some S.
If I want to increase Potassium I can either use Potassiumcitrat or Potassiumsulfat. I have both
Any recommendation which one to use and how much?
Guess the sulfate will add extra S which is not necessary but I don't know about the downsides of the Potassiumcitrat. Maybe ph effect? Won't be much of an issue because I have DTW.
Hope somebody can help me.
Best wishes!

Honestly use hydrobuddy calculator to work out how much add.

Just add your current nutrients as a substance, and it becomes very easy adjust them.

My DIY flower additive consists of potassium sulphate and mono potassium phosphate.

I'm not sure if citrate is considered a organic, if it is I wouldn't use it.

But MKP adds more P than K and that's the issue.
Do you have any information about adding to much S because K2SO4 adds a lot of it
But I'll check out the calculator
Thank you!