Did you order the grid+ or the grid+ v2? Only the V2 allows different voltages across the 6 fan channels, the plus uses a single voltage for all the channels.
Software wise I gave up with CAM nearly a year ago - absolute trash bloatware that seems to be getting worse and worse. A quick glance at user reviews seem to have similar experiences.
Personally I use
Grid Control which is a very lightweight app that reads a temperature from OpenHardwareMonitor and changes the voltage of the controller thus changing fan speeds.