Hey Freiya, nice grow and nice choice of plants. The NL is the only one I have grown and it takes a while, its the longest plant i have grown, will be 95+ days to be ready. The early growth for the first two weeks is slower on autos.
As for your water I found it to be better for us to NOT use a schedule. Only ever water them when they need it. Lift your pots and see how much they weigh, only water when they are light( I use very light as my measurement). At the start of my grows I pre water to runoff, with cannazym and rhizotonic 3 days before planting the seeds. This means the seedling will not get watered till about day 5. Then We will only use approx 100mls water per plant for the next week, probably 2 waters.. Thats about half a coffee cup, every 3 or so days. Sounds way to dry I know, it was hard to get my head around it too. Obviously keep an eye on them at the start, dont let them wilt, but after a while you can lift the pot and know its two days from needing water, or whatever. We also, after that initial water, never water to runoff in veg. At 3 weeks of age they are probably getting 2 litres( half gallon) at most per watering, making sure they are very dry between. Our plants are in 5 gallon pots btw.
LST, on your first grow, who would attempt that??????? thats right we did, and it turned out well for one and brilliant for the other, go for it (carefully lmfao, yep i broke a branch off). day 19 should be ok, not much later to start tho.
Hope this helps its just our method and works for us. Your plants look good enjoy more stress less, have a good one