Wow steel and iron - thats hot. I have "only" done bronze and silver. i have some posts about my experiments with casting metal from prints. Here and here.
I have other posts with similar content but these where the most obvious ones. The main reason for wax casting is detail. Even with delft sand(which is also what I use) the details of investment casting is way better, which means less work afterwards (I assume the ceramic coating is similar to investments casting?). Also the limitations on shape is less.
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Yes the ceramic coatings are the shell for the investment casting. They usually dip in fine several timers, then in coarser material for added strength on the form. When you do precious metals, they recommend a centrifuge to avoid porosities, but I have not tried that, and it seems like a good flux would lift out problems well. I have been watching you pour, and you are ahead of me on videos! That I have NOT tried yet! Keep on pouring! :)