I don't sprout my seeds in a paper towel anymore. If a seed isn't viable, it won't sprout anyway and it prefers to sprout and it is better for it to sprout in the soil. I learned that from @Melvanetics
I put the seed in moist soil and cover the pot with plastic and put it in a warm dark spot. As soon as I see it pop I put it under a light (CFL) as close as I can get it like inches away. Ever since I have done this I have had no issues with leggy plants and they have short fat little stems.