mozart minuet in G with trio

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i'm almost done learning this piece but the first part of the trio is slowing me down.  The first set of 16th notes where the pinky plays the F# in the left hand is slowing me down.  My hand isn't comfortable when playing it, I keep my fingers some what curled, is this wrong? Should they be flat because my pinky doesn't like to land on the F#?  Also i tried some rolling thing but that didn't really help.  Anyone know this one that can give me any idea how to practice?