My soil is pretty nutrients also.i just used water for first 3 week,ph adjusted.i then follow directions on advanced nutrients for 3 part ph perfect and use budcandy and PK spike immediately in flower and stop nutes 2 weeks befor harvest and give ph adjusted waters.Be very careful nutrient doses with pre nuted soil.even 50percent dose rate.1ml/1ltr of 3 part ph perfect. Good luck and message me if you need any tips.good luck buddy!🌱