With a bucket you should be testing your solution daily to plot any changes in your EC.
Too much of a swing in conductivity either way required correction.
good rule of thumb is if after a day or 2 your EC has altered in either direction by 0.2-0.4 then adjust.
If it rises in EC then adjust your bucket to be lower in EC than previously.
if it lowers in EC then adjust your bucket to be higher in EC than previously.
dont adjust your pH unless it falls outside of 5.8-6.2 as a slight swing between this range is perfect.
my honest opinion is that the 2 day flush has only compounded your problem.
Based on the fact you “did” have a ph problem and a high EC problem I’d say you probably locked out some N P and Mg.
Personally would mix a 0.8EC solution of changing your bucket next time and sit there unless the levels tell you differently.