the problem is partially the fact you are growing them indoors. Try starting seeds in a damp paper towel with a mix of H2O2 and distilled water and as soon as the roots appear put the seeds in a pot, 1 gal for 3 or 4 seeds and 3 gal for more and carefully plant them just below the soil level before any leaves appear. I use a pen, pencil, or a good ol' stick to make a small hole in the potting mix for planting the seeds in then gently press the soil down around the seed . the "same day" put the pots outside in a part shade area of the yard. when they sprout there will be no sun burn or stress from introducing them to a new growing condiction. Once a plant get accustomed to be life indoors it can be hard to make the transition to the outside environment. I too used to start seeds and cuttings both inside either in a sunny widow, under florescent lights, under metal halide lights, and under High pressure sodium lights. All with the same results once introduced to the outside. A high percentage of sunburn, stress, and death. Since a friend of mine named Boris showed me how well his cuttings did outside even though his where done 6 weeks after mine I stopped starting both cuttings and seeds inside and will never go back. granted the seeds I put in the damp paper towels are inside until the roots show but that's it.
