I'm finding that with the "lava debris" and other coarse material that water flows through pretty easily. Looks like this type of media requires a good soaking in a pail of water to get it saturated. I'm doing that about once a week and then in between I periodically drench the new roots with a spray bottle.
I repotted the plant with the new growth towards the middle and pointed upward more. This results in the other leaves to be tilting downward somewhat dramatically... but I figured the priority here is for the new growth.