Cheesy dick grow

Using royalmix plagron (no nutes required) I will be using plagron power roots this week. 5 Cheesy Dick and 1 OG Kush I have decided NOT to PH down anymore with my water. My water is PH 8 and using soil should regulate this. My last grow I was chasing the PH run off and kept trying to lower but researched this method sometimes isn’t accurate. My plants yellow too early which effects yield and not lasting full flower. I will eliminate PH down this grow to see if it helps.