Whew. Rick, did you ever think that you might be overdoing it a little? I open a bag of ProMix, scoop it out, dampen, and sow seeds. Done.
If you tried cheap potting mix in the past, a professional mix might work better for you, be easier and cheaper than buying all that stuff.
If I had to run around and find and buy all that stuff, I'd never sow any seeds.
I think you're really over thinking this. Just use potting mix and don't water. Control yourself!
Karen