We have some curves available here: http://www.inkjetmall.com/tech/content.php?158-Piezography-K7-Additional-Curve-Resource
Sometimes, you can get good results using a curve for a similar paper, but the best output is obtained by using a curve specific to your exact setup of printer, inks, paper, and computer/print settings.
I assume "CIB" stands for Canson Infinity Baryta- correct? While this is a beautiful paper, you may want to try some other glossy papers before deciding to change inks, because the paper has a BIG effect on the ink tone, and you may get the look you want by simply using a different paper. I recommend (if you haven't already), getting some sample packs to try a few sheets of different papers, and evaluate the output to get a stronger handle on the paper(s) you prefer, and direction you may want to go regarding ink tone. From your order history, I see you're using a WN/SEL split tone, consisting of WN 1-3, and SEL 4-7. Many people like to develop their own custom Piezography ink set by using shades 1-7 of different ink tones, which I think is very cool and takes Piezography printing to a whole new level for these people, experimenting with ink tones/shades and papers to get the specific look they seek. One thing to keep in mind, is some images look best with different tones (and everyone's preference/perspective is different), so you may be happy with the ink tone with landscapes, but not as happy with it when printing portraits for example- so, be sure to evaluate a few different images before changing or settling on an ink tone.
I hope this helps.
Best regards and happy printing~ Dana