If your F# is sounding terrible, like half step between F# and G, then
F# is closing late with D. That’s most often the case.Or F# itself is leaking, but then nothing below it will play. Use the adjustment screw on, beside, or behind D key if you have those, or slip a piece of paper under D Y-arm, precisely in-between the arm and the adjustment lever under it.
I should post some pictures and a video to make this easier. Hang in there, coming soon! This is mentioned in my long video on the flute adjustments page. I am talking about F# at around 2 minutes into the video.

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