Sky,
I know your pain,lol! The French trade guns all seem to "bite"! There is a fix though.
I bought a real nice Fusil de Chasse, a Mike Brooks kit, assembled by a gent in Arkansas, that was a typical Roman nose with a sharp edge that followed the butt plate heel finial all the way to the front of the comb. After numerous cheek beatings and abrasions, I took out my bowie and scraped the sharp edge off and it made all the difference.(sold it in one of my frequent weak moments,lol)
Yours probably needs the comb rasped down a tad.This seems to calm the cheek bashing considerably! The angle of the the butt on these Frenchies kinda disturbs me,but it's possible to fix that also.