I can't see your picture.
The spring preload adjustment on the main spring is set by the spring perch, by adjusting the circlip beneath it. They are quite firm and can take a little heat and force to move. Be aware that the circlips can have sharp edges and cut away some of the perch when removing and refitting. Swarf in the fork doesn't lead to a good outcome.
Then there is the PFP (adjuster on fork cap). This adjusts the level of preload on the inner cartridge spring.
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