Thank you for all the replies. I use T12 fluorescent, alternating 4100K and 6500K. One thing I was doing incorrectly was not removing the plastic soon enough per ginger2778. As for depth, I followed Craig LeHoullier's guidance per his video "nctomatoman's dense seed planting technique," covering until no longer visible.
Unfortunately, doing this only once per year does not lend itself to learning by trial and error. Though, now that I think of it, I suppose there is nothing stopping me from purchasing some "throwaway" seeds and trying until I get it right.
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