If I understand you correctly, you want the different joystick inputs to have different strengths of effect. One way you could do this is with the multiplication block, with something like ( (controller C position) * (0.5) ) when you use the c position instead of just putting controller C position.
Check out my post up a few from here: Velocity blocks aren't working on vex code - #6 by EngineerMike
Obviously you will need to change to use C instead of B axis, but this should put you on the path to get where you want.

Itās worth noting that @EngineerMikeās comments about not being able to control the Drivetrain Velocity using blocks is true for driver control (when most of the time the simplest solution would be ālearn to modulate your input on the sticksā, but I can understand how in @goatswag 's example even that may not be enough), but they work just fine when youāre doing autonomous programming, and theyāre much easier for beginers to grasp.
