Blue Dream, first time on DWC

Hello. The plant is developing at an alarming pace. Tomorrow I will move it into a bucket of 15 liters. Today she drank almost a liter and a half. This is the last week of vegetation. Today I lit a second lamp on two CLU048s. There are negotive moments. I tried to add the concentration of the solution, this week, raised from 1.5 to 1.7 and the next morning I saw artifacts on the leaves (one of the photos). I thought it was a potassium overdose, but at the same time I think it's possibly calcium difficite. (While the concentration of the solution is 1.5, but it seems to me that it should be raised higher.