I got it working. TL;DR reseating the ram fixed it.
The BIOS was previously seeing the full 32GB and memtest passed on the full 32GB. I factory reset the bios as there was some overclock setting still in there, still didn't work. I reseated the one and removed 3 of the sticks to see if unRAID would only report 4 of 8. It saw 8/8, second stick 16/16, 3 sticks was 24/24, and adding the 4th finally showed the full 32. I really didn't think that would be the problem because I haven't touched that moboard since I had my windows installed on it which was working with the full 32GB, but I can't argue with results.
Thanks for the help!