Your new twisted leaves are not an excess/ def issue neither a disease, I guess it is just the leaves that are trying to be on the best position to take all the light so as you have practiced LST the leaves are trying to take the best position.
Your issue is not PH related and you'd better know that cannabis can grow in soil with a ph range between 6 to 7 without any harm done to your plant, moreover the soil have a self buffering propriety so the ph is tending to "auto stabilised". You can check the ph and composition of your tap water on your local company website to know at least that value