Thanks, Kyla. It works for me, but then anything that kept me from drowning roots would be an improvement.
I'm not sure why I can't stop myself from over-watering seedlings. I feel as if I "should" water everything until water comes out the bottom. Of course, that is a good way to kill seedlings.
That one "good" batch of coir was even better for my clay soil than pine park. And it's benefit has lasted 3 years.