I meant to get back to this sooner to post the results of my tests.
After lots of frustration with Epoccam, I went the NDI route.
I used this driver: https://resolume.com/forum/dow..., found on the Resolume forums.
After testing 3 different iPhone apps (I wish that more of them had demo versions!), I found that the NewTek NDI app to be the only one to work for me.
I had a private wireless network that I set up (AC4000 with a range extender for good measure), and I found the whole set up to be 100% reliable, good image quality (in fact WAY better than my logitech 920 or 930, which were the wired back ups for the system) and lag that I could easily deal with.
All in all, super easy to use and rock solid performance. I know that there are plans for Isadora 3 to natively support NDI, which will be even better, I expect.
Highly recommended!
Thanks for the help,
Hugh