I guess I could have used coconut fiber and the others you are using too, but I got this list from the grower so I just followed it since I am new with cycads. I mean new at starting all over again, and hopefully successful this time!
If at first you don't succeed, call it version 1.0 Keep smiling, it makes people wonder what you've been up to. My "bunnies" are in fact Guinea pigs. 5 of them so far.