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Hard to say looks Charnley like, I am not familiar with the Fiddich River stones.

As for performance, the unknown grit in the stone and how it is manipulated with technique determine performance....

Try using the stone with a very fine slurry once you have a good edge, then try using the stone with just water and/or oil, Smith’s or Ballistol to refine an edge, also try varying your pressure.

Very friendly edges but not the keenest, it's been a joy to use and shave off of.

How are you using the stone? What grit are you pre-finishing to.