David...
Your potting soil mixture is fantastic !! Used it with the azaleas, really nice mixture !! They're potting extremely well. Water flows evenly through the mix, stays moist, is relatively lightweight for it's volume.
Tried using Perlite to keep it fluffy and Vermiculite to clump and keep moisture around the roots as recommended by another poster.... this combination with your mix does extremely well also...
Plants are coming up all over the place.
Thanks again for sharing !!
Peter