Testing has shown that bow mounted riggers flex during the drive phase affecting the pitch of your blade. The degree of flex is dependent on your strength but indications show that it may be greater then 2-degrees of deflection.
RANDALLfoil optimal pitching is 3-degree or less and testing has shown VIII can be pitched at 1-degree.
However, if you are rowing with bow rigging please account for extra deflection and trial full pressure to ensure your pitch is giving you the non-slip 'lock on' feel RANDALLfoils deliver. Adjust accordingly.