CC's are low resolution so will sound jumpy with some parameters if you are used to changing the values using the device's own knobs. Try using NRPN's and you will get a smoother response.
Oh hang-on, you are aiming for that, LOL! Nice one. I use a Wave Ideas Bitstream 3x with my Tetra and can assign more than one parameter per knob on it, up to 6! Really fun to set up different value ranges for the different parameters set to a dial so they don't just sweep perfectly in unison, or don't actually change a parameter until another reaches a particular point.