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If you plant too shallow the seedling may have trouble scraping off the shell as it emerges leaving you with "helmet head". When you say humidity dome do you mean a cup? It gets too wet under a cup and you will become susceptible to damping-off. Put a hole in the side on the bottom and a hole in the top. the idea is to get some air circulation. You really do not want humidity over 70% and you only want that for the first day or two.I planted directly into soil in 2.7 gal pot with no problem. You don't want to pour water over your seed if you do it this way, the water can wash the seed down deep.
I just put the seed in wet soil 1/4" deep, put a humidity dome over it and waited. If it gets a little dry, mist with water in a sprayer or lightly dribble water.