The plant is growing fantastically, looks fantastic and smells very good. It has really shot up this week and has quickly gone into flowering.
Occasionally I've seen some signs of nitrogen toxicity, this has increased over the last few days, so on day 28 I watered it more heavily to fully saturate the medium for the first time and to produce drainage. This had a pH value of just under 6, so from now on I will only adjust the pH value of the irrigation water every second time, from the moment the drain has a pH value of 6.5.
The plant seems to have already recovered from this flush today on day 29.