However at this speed and especially amount of reverb it gets way blurred. Hopefully you did not add extra reverb!
Ah but I did... Light Concert Hall as usual. I find the acoustic in my regular church too dry otherwise. I like to have a bit of a 'churchy' sound even though it means losing some of the clarity . On the bright side I don't need to use reverb in the booming basilica that I now sometimes play in (you won't like the bwv686 that I recorded there
) Talk about blurred.
Beside that, if sitting in the middle the high f is same distance for right feet as the low c to the left feet. And the low c is often used from Bach. Nevertheless interesting that he used the high f because the pedal tones were often more limited in his times as nowadays. I am not sure, but I think on "my" organ it goes to the high g, but it is also almost a modern organ, no baroque one (from about 1905).
Yes, distance-wise it should not be the same and not more difficult. I think high notes are more difficult just because they are so much less common. I have the same problem in the 'Christ, unser Herr zum Jordan kam', some very high notes in the cantus firmus though not right up to high f.