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There is a great deal of guess work going on here, as the OP has not given much information "relatively high speed with a small F/stop number" means nothing.
Louie give a little more info on what you mean by relatively high speed and small aperture. (Actual figures would be better) chris-p is suggesting a wide aperture which is a small number, but I'm guessing you mean such as F//16 which phyically is a small aperture, but an high number.
One other point are you using an image stabalised lens?
I would go along with Eileen re. 100% viewing of raw files looking sharp at default settings in a convertor.
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