Arturia,
In case you don't know, then original hardware factory presets like 11 Brass and others has settings and sound far from the original. I suggets you go through the original presets again, and correct those that sound incorrect.
Many compare the quality of a softsynth with the original hardware using those sounds, and it give a wrong impression if they sound incorrect. The presets should sound correct as they can - no matter in which synth for that matter. I don't understand, if you don't care, as it's a selling point.
Just my thoughts on this.