Finished first 21 days! Nutrient question

Grow Support Autoflowers
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  • White Widow CBD Autoflower from ILGM
  • Method: Soil-Fox Farm Happy Frog
  • Vessels: Plastic 3- gallon Pots
  • Light system: Bestva 600W LED

My three (3) plants look great, to me. Green and healthy. Plus, I have been doing Low Stress Training in the past week to expose it to more light. One plant I actually ‘topped’. They are all looking good. My PH is in about 6.3
Question: tomorrow I am expecting my TDS/PPM meter to arrive. I have studied on how to water and then collect the runoff to ascertain the math. First I will PH and also use the tester on my tap water. Ive been watering by letting the water sit overnite to minimize chlorine. I also have a gallon of distilled water.
They are also due for the next watering tomorrow.

I have a bottle of FoxFarms ‘Grow Big’ and ‘Tiger Bloom’. I understand that the amount I use, to avoid burning, will be determined by the pre- adding nutrients soil’s PPM is at? Minus the PPM of the tap water? Or if I use the distilled water then just the straight PPM of the soil. Correct?
Then, if warranted by the PPM of the watered soil, I will add the nutrients, but probably at 1/4 of the amount on Foxfarms feeding schedule. Then wait to see how the plants do?
Am I on the correct track?
Also, I read that those nutrients will screw up my good PH. Is that true only if I use too much nutrients? Or, do I need to be checking the soil ‘PH’ regularly anyway, so…I’ll just cross that bridge if I find the PH screwed up in a week or two?
Am I thinking clearly?
Any input is greatly appreciated!

Thanks,
@FirstTimer1

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Here is the the feeding schedule from fox farms for happy frog and their line of nutes. With autos I would do about a quarter to a half of the suggested amount.

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I just realized that feeding schedule doesn’t have have grow big or tiger bloom in it. Here is their soil feeding schedule as well.

fox soil chart
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I’m growing in ocean forest and have been following this feeding schedule I found. Should be good with the happy frog too. I also started to add the beastie blooms and cha ching around week 8. I would pick up some calmag as well.

Screenshot_20210125-220449
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As for the ppm. I’ve seen people say to start when the ppm of the run off reaches 800. I started with nutes around week 6. Where happy frog is not as hot as ocean forest you may want to start with the nutes a bit earlier than that.

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Thanks! I appreciate it!