I have a 4800 and use happily the p2 inks mostly with P2 gloss profiles with no problem. I recently had some matte paper and tried the profile for Hah Brt White. I thought you could print this way on matte surface and tried the regular K7 profiles thinking it would use the ink in the first Blk cartridge instead of the 4 th yellow cartridge when it does this. Do I need another profile to do this ?
Use the P2 (UHD) curves from the community edition found (on mac) in >Piezography>Curves-HD
The K7 will think your PK ink is Shade 7 and darken your highlights.