I have a Moeck Rondo and though the high F requires a little care, it definitely plays, so it may be that your particular Rondo is simply not made well. I play Mollenhauer Denners otherwise, and they’re fine up and down. Oddly, I have a Mollenhauer Soprano on which I have the inverse of your problem, in which the high C simply won’t play no matter what I do.Hope you find a nice high F somewhere.
