You do not understand the chart i posted?
My base water is 130 ppm, I use the 3-2-1 program with MKP at transition, TDS is 1,100 ppm and I try to keep that target concentration. If I have to add water to dilute down, then I do.
Plants need P and K much sooner than the last couple of weeks before harvest. Thatās why I do a modified program for 3 weeks right at the flip, using Monopotassium Phosphate and the Jackās reduced to 2-2-2 with 1.2 of MKP.
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i do not im one of those people who need to do it but cant understand it if you told me how to do it ya know, i can make a grenade from a soda can and some batteries but i cant tell you how lol idk just how my brain works.
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This is why I add part B boost and did so every time I used Bloom or Finish @keryilias 
If you donāt know your water source make up I would recommend using the part B boost
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This is why i recommend to stay with the standard 321. Using finish for one week at the endā¦cannot imagine it doing much.
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I did and itās doing beautifully ty for the advice Iāll prob keep this up every other day till about a week or week and a half then swap back glad I learned something new thank you again 
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I used the finish for weeks 6-8, honestly didnāt see a difference with the Bloom or Finish and went back to the modified 4/2 schedule . I havenāt used jacks this year at all and went with Mega Crop 1 part and will probably never go back to jacks
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Nice when I runout of jacks i might try that one always good to try new things and never stay tunnel visioned on 1 ideal, always expand your knowledge.
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Less expensive, 1 part and has all the macro and micro nutrients needed, even a small % of silica
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