Drop rh, no need for high humidity after seedling has first set of leaves, only causes significant transpiration issues, seedling needs co2 not water from the air, nutrients are in the soil, keep that wet and air slightly drier 45-55% to promote evaporation.
Phosphorus content in medium at germination has a strong effect of vitality and growth on young seedlings. I am not saying you should pump the soil with Phosphorus but In appropriate amounts I like to add a little extra to seedling pot. P is essential for the growth of seedlings from day 1, its known that deficiency early of p has a developmental ripple effects later in flower season.
Ideal media composition for root growth is 40-50%pore space, medium could use a little more perlite maybe given plastic pot.
Looks all good, good luck with new growth, 👍