I finally fixed my problem. I pieced together information from various posts to get me there. In case someone else runs into a similar issue, here's what I had to do:
Install TWRP via Odin. You won't find a TWRP for 10.1 WiFi model (SM-T520) ...
Can also be retrieved here if you want to flash via Odin.
I fond myself in a situation where my tablet wouldn't boot and I needed to install a custom recovery, so I had to flash via Odin.
Loving the ROM. Thanks for the work you've put into this!
Did you just flash a new radio? I just flashed the latest radio and my phone got stuck at the splash screen. Went into recovery and thought I saw something similar to what you had (can't be sure though since I didn't write it down).
I did a wip...