You don't necessarily need to pH in soil but only with straight up organics and I'm not talking about from a bag. If you're using synthetic nutes this is not organic.
Not to offend here but I see multiple sad plants experiencing pretty serious clawing which is usually excess nitrogen or over watering/too much moisture held in the soil and it's not drying out enough before you water. It's hard for me to say just off of the info provided and pictures. The twisting looks like too much water, but the crispy leaves pointing up around the edges suggests too much N.
As for the crispy yellow it looks like possible nutrient uptake issue which happens if your pH is whack and/or excessive nutrients.
You want to know your pH and look at your medium and nutrients, and perhaps rethink it.