Just feed plain water for awhile and then go back to just the A/B and maybe a couple other things if you feel the need.
You don't need to bother checking pH runoff either.
And that drip clean is unnecessary as well. It's just phosphoric acid and potassium oxide. The same thing as Pekacid which can be purchased for under $15 a pound in water soluble form. One pound will make gallons and gallons of that bottled stuff. Which is all they're doing. Diluting it and putting it in a bottle. It's really not intended for using the way you are in containers of soil.
Same NPK ratio of P to K but Pekacid is stronger since it hasn't already been diluted with water.
Drip clean
0-0.18-0.6
Pekacid
0-60-20