Have you tried a mud mix yet? I'm an indoor grower and had the same problems before. I used sphag, bark, a sphag and bark mix. So I decided to do an experiment I bought some cheap seedlings and compots from a vendor with a bad rep on OB. If they died it didn't matter, and put them in different mixes and the mud mix worked the best. I used OFE seedling mix 2, which is peat moss, fine bark, and aerolite. And I'm experimenting with a peat, med bark, aerolite, and hydroton mix for larger seedlings. You can also replace coconut coir for peat moss.
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