when i run my drippers instead of a dwc, if i run them 24/7 the ph goes up faster then if i run it at 15 min intervals 4 times a day. Thats how i started to deal with it, but i dont even ph my water in veg to often. the more plants eat the more unstable your ph becomes, i think thats becoming a rule of thumb.

Sulfuric acid isnt too uncommon.