Well... Thanks for the discussion! I appreciate everyone's willingness to help.
I like the idea of adding rice hulls, but apparently, while having their own unique benefits, they don't quite do what perlite can do. So, I'm thinking of adding a mix of both. We have the rice hulls and will order some perlite. Now the question is how much of each to add to the FFHF soil we bought to use for our next grow.
We lost our crop to spider mites, so this is a sad day here. It also means growing our next crop can begin soon after we sterilize our growing room. We can probably germinate seeds before the end of this month.