According to the Mathews cam chart that I have, you can swap to a Super Soft Cam# SS-CR, 60% let off. Mini Max Cam for the C3 has a 29" max D/L. I do not know what that will do for your speed, and if a cable/string swap is in order. Mathews site can probably tell you this.
Hope this helps.
NOTE:This info applies to right handed bows. I have info on the left hand if needed.