I would suggest trying a basic peat or Coco based potting mix in a 4-6" pot next and skip the specific seedling routine. Never had one, never had an issue with a seedling so far.
I start mine in 4x4 inch square starter pots or 2L round pots of potting mix/perlite depending on how i feel, water it once to runoff before I put the seed in, and then leave it for 5 or so days before watering again. If i start them in 2L pots, I can go a week without watering. I think they might be staying a bit wet.
I have found, if you create an artificial environment far different from what they will be growing in (for example, dome, high humidity and ow lighting) they will object when you up the lighting and dry out the environment.
For example, if I start a seedling at 7.5k lux and 80% humidity like they say, and then try and lower humidity to 50% and up the light to 45k lux, they nearly die. But if I start at 28c, 30% humidity and 45k lux, they have no problems at that temperature and humidity.
I find babying seedlings the worst thing you can do. Try sprout them in the conditions you will be growing in, and there won't be a transition period between environments that stunt the plant.