I am also using a 15-30-15 fert. Anyways, I usually only water/nute on Wednesdays, with occasional straight waterings on sundays if its been hot (like this weekend), and I usually use a full scoop(full dose) of the nutes in each of my water cans, along with a table spoon of molasses, and I use lemon concentrate to lower my Ph. Do you give full doses every time you feed or do you do half doses if you feed a few times a week?