I tried to make it work as well with just a media bag, it didn’t unfortunately. The zeolites(all sizes are necessary) growing bacteria film on them in a concentrated reactor, that is getting the proper flow ,then the shaking of the reactor multiple times a day is critical to the Zeovit system working. I used the bubble magnus reactor as well, it may feel like junk but believe me, it does work quite well. The shaking is what feeds your corals, you want to shake. You are looking at it as a nutrient absorber but that is not its main function.
I toyed with Zeovit for a long time, trial and error of media bag, basic Zeovit additives, 4 part Zeovit additives, reactor, everything they offer pretty much. I found what worked and what was a waste of time.
I also ran a high bioload like yourself.
With what you are doing currently you won’t notice any differences fwiw. It’s an expensive system, I don’t want you to waste your money like I did. I wish I knew what to do from the get go.