Unable to control chassis fans

Hi all.
I am trying to turn my chassis fans up a bit to get a bit more airflow. The CPU fan for the AIO pump is fine, I can control that via BIOS or Fan Control, although I'm not fiddling with it. The AIO pump is there and I have not tried to change it. But what I can not change is the chassis fans, whether through BIOS or FANCONTROLL application. I would like to adjust the curve slightly just to get a bit more air in around my 2080TI FE. Both the Front three (single unit - I think) and rear exhaust fan show up as one fan (unless one is just not detected, but they both seem to work fine).

Are the stock fans just not controllable? Is it because the front and back go to a hub or something? Any help appreciated. Specs below :)

Case
PCS SPECTRUM G ARGB MID TOWER CASE (PWM)

Processor (CPU)
Intel® Core™ i5 14-Core Processor i5-14500 (Up to 5.0GHz) 24MB Cache
Motherboard
ASUS® TUF GAMING Z790-PLUS WIFI (LGA1700, DDR5, PCIe 5.0, Wi-Fi 6E)
Memory (RAM)
16GB Corsair VENGEANCE RGB DDR5 6000MHz (1 x 16GB)
Graphics Card
INTEGRATED GRAPHICS ACCELERATOR (GPU)
1st M.2 SSD Drive
512GB PCS PCIe M.2 SSD (3500 MB/R, 3100 MB/W)
DVD/BLU-RAY Drive
NOT REQUIRED
Power Supply
CORSAIR 650W CV SERIES™ CV-650 POWER SUPPLY
Power Cable
1 x 1.5 Metre UK Power Cable (Kettle Lead)
Processor Cooling
PCS FrostFlow 240 Series ARGB High Performance Liquid Cooler
Thermal Paste
ARCTIC MX-4 EXTREME THERMAL CONDUCTIVITY COMPOUND
Sound Card
ONBOARD 6 CHANNEL (5.1) HIGH DEF AUDIO (AS STANDARD)
Network Card
ONBOARD LAN PORT
Wireless Network Card
NOT REQUIRED
USB/Thunderbolt Options
MIN. 2 x USB 3.0 & 2 x USB 2.0 PORTS @ BACK PANEL + MIN. 2 FRONT PORTS
Operating System
NO OPERATING SYSTEM REQUIRED
Operating System Language
United Kingdom - English Language
Windows Recovery Media
NO RECOVERY MEDIA REQUIRED
Office Software
FREE 30 Day Trial of Microsoft 365® (Operating System Required)
Anti-Virus
NO ANTI-VIRUS SOFTWARE
Browser
Google Chrome™
Warranty
3 Year Standard Warranty (6 Month Collect & Return, 1 Year Parts, 3 Year Labour)
Delivery
STANDARD INSURED DELIVERY TO UK MAINLAND (MON-FRI)
Build Time
Standard Build - Approximately 5 to 7 working days
Welcome Book
PCSpecialist Welcome Book
 
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