First off we will start with the ph. That is a soil ph meter, you need a liquid ph meter like this:
https://www.amazon.com/gp/product/B074M8F9RG
You want to make sure your water and nutrient solutions are in the correct ph range before watering/feeding. 6.3-6.7 or so for soil. Some fertilizers drastically
lower the ph and some raise it. You will need some ph up and ph down to adjust it.
https://www.amazon.com/gp/product/B000BNKWZY
And you don't want to give them fertilizer every time. Alternate food then plain water the next time they are dry. And don't give too much food to autos, they can
be sensitive to fertilizers, some strains more than others which is why one of yours looks more burnt from the food than the other. It's much easier to correct underfeeding than it is
to correct nutrient burn from too much feeding. Err on the side of caution always and feed light. You can always up the food if they need more.
As for your hesi bloom, it doesn't have enough nitrogen for vegging and not enough phosphorous and potassium for flowering. It might be good during the early flowering stage, but it doesn't look all that great to me. And the Root T, I don't know if that does any good or harm or not. It probably won't hurt though, but I am not certain. I would say skip it.
I use these nutrients in my grows.
https://www.amazon.com/Fox-Farm-Liquid-Nutrient-Formula/dp/B00D93NIFY
Grow Big and Big Bloom starting at week 2, then after they have been flowering for about 3 weeks I usually drop the Grow Big. I start adding Tiger Bloom after the
first week of flowering, keeping the Big Bloom going the whole time.
You will also need some calcium/magnesium supplements like one of the following:
https://www.amazon.com/General-Hydroponics-GH1772-CALiMAGic-Quart/dp/B00GZRKI40
https://www.amazon.com/Botanicare-CAL-MAG-PLUS-Gallon/dp/B000J2CUQ6
If you are using RO water or have extremely soft water you will need to use the calmag every time you water, if using tap water that is hard you don't need it every time usually.