Well system secret is twofold Evan.
We usually 'pot' the bigger Aroids in 1/2 55 gallon drums. Heavy in compost and humus + 1/2 topsoil.
Basically like planting them in the yard.
BUT come mid Autumn we downsize them to more manageable (read able to carry up stairs...lol!) 12-15" plastic pots.
Many of our Aroids, especially the larger ones we just bare root thru the winter.
Basically just throw them down on the GH floor.
Macro, Odora, etc do well this way.
Haven't stored rhizomes in sawdust, shavings, etc in 10 years.
We had too much rot that way.