I give up on trying to fix this issue on my own. I'm turning to the community for help.
Here's the deal.
HiveOS running Phoenixminer 5.6d with 6 RX 5700XT Sapphire Pulse cards.
They're running really hot! They all have the exact same memory type (Micron) and are all flashed with the exact same bios.
My tuning commands are simply: -tt 90 -fanmin 95
My clocks are as follows: (these seem to be the most stable and optimal during the Spring/Summer months)
FAN 99
CORE 1400
VDD 800
MEM 910
MVDD 1300
VDDCI 800

Now some cards are running at 57MH/s. That's fine. That's what I want... at minimum. Those temperatures are 68 Core and 102 Memory.
But others are 50MH/s and temperatures are 74 Core and 106 Memory. So I'm chalking it up to thermal throttling.

Okay. So let's boost the fan speeds... but the fans are already set to 99%. But HiveOS is telling me that the fans are only running at speeds between 81% - 88%. No where near the 99% that I've set the command (-tt 90 -fanmin 95) to.
Where did I screw up?

Drivers 20.40
Kernel 5.4.80
OS Ver 0.6-203@210519