I might be wrong in thinking this would help with octane issues.
A kev fuel mod changes the A/F ratio.
It helped me across spain when the engine would run different up in the hills.
A little tweak to make it run leaner and sorted.

I don't know, does changing A/F help with crap fuel?

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PCV REPLACEMENT ECU WITH 04 WIRING LOOM STAGE1&2DNA GEL SEAT INSERT LOWERED 20mm FRONT+REAR CLUTCH ARM MOD
FORKSPRING SPACERS TALLER SCREEN THROTTLE GRIP CAM MOD DISTANZIAS 46TOOTH REAR SPRKT
SPEEDO HEALER 30MM HANDLEBAR RISERS TOPBOX MOUNT 08 XTX SORTED, ALMOST.
...SHEEPSKIN - Because a pain at the rear is not just a moany pillion.