Mine did it for the first couple rides and now after I have ridden it for a couple months doesn't do it anymore. I think the efi adjusts and levels it self out per riding style. I don't know if maybe I had changed the way I rode or the xx adjusted to me but it fixed itself. I would wait a bit and see what happens. just my 2 cents.
mine did too during break in, after everything loosened up, no problems.
i cant imagine mine with a 13T front sprocket. the gears would be so close together you wouldnt be able to fully utilize the broad efi big block powerband. stock gearing really lets the long powerband to draw itself out in each long gear imo.
just practice more with the clutch if you are stalling in the slow stuff, prolly lugging it down too much.