Injectors can get gummed up if you've left it standing for a while. ~I would suggest you leave the premium fuel, and if you can live through a couple fo tank fuels of rough running, it will probably smooth out again.

Next time you store it run some fuel additive through the bike before storing (you can get stuff specifically if you're laying your bike up)

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centrestand, handguards and deflectors, scottoiler, handlebar muffs, panniers, cush drive mod, compass, power socket,
petebog rack, handguard extenders, satnav, tank bag...to be continued