First Grow - Stardawgs from clones

Hi Everyone! First time grower and complete horticultural novice. I am a studier however and whilst I've been slowly buying all my kit to get started I've been researching like crazy on best methods etc. Setup: Budbox Pro XL White 2.4 x 1.2 Pitched Tent 3 x Maxibright 315w CMH lights 8" Hyperfan Extractor with Carbon Filter Mother Nature C02 Generator Ram Floor Fan 20l Propots 60/40 Canna Coco/Clay mix BioGreen Nutes Soft tap water (always left overnight in butt) Run to waste trays 9 litre humidifier Week 1 obtained cuttings locally and planted into 4" rockwool blocks to start. Watered with just 2ml/l X rooting for first 7 days as per feed chart. Humidity kept high between 70-80% initially set them under 1 light. 1 plant was very sick when I got it and took a good 6 days to come round. It is now slow but healthy. I am planning on topping these to keep the height down as the 315s are very powerful and with my trays I can really only grow up to around 1.5-1.7 feet tall otherwise the plants will be too close to the lights. In my haste and stupidity to get this flourishing fast I put them under 3 lights at day 7 and they responded badly. Curling dry edges and stunted growth so immediately switched back to 1 light. Now on day 10 they are looking much better but still very slow. Will update next week and hopefully they will show some growth!